打ち上げ花火の作成体験で4号玉を作って、打ち上げてきた!
Following on from my previous pros and cons, this time I took part in a tour hosted by Otonami, where I tried making my own fireworks. While handheld fireworks and sparklers require less gunpowder and are often suitable for children, this one was a more serious experience, filling softball-sized No. 4 fireworks with gunpowder . Participation is prohibited for those under 18. For this tour, I was assisted by Mr. Sasaki, a “wabi” (Japanese fireworks) craftsman at Marutomi Kobo in Yamanashi Prefecture. Unlike Western fireworks, which use a flame reaction between metal pieces to create their color, this craft utilizes only black powder for a truly Japanese style of “wabi .” I also recorded a video of his lecture, in which he gave a thorough explanation of “wabi.” It seems that safety standards for fireworks vary depending on the prefecture. In Yamanashi Prefecture, the regulations are relatively relaxed, requiring only a 50m distance from the fireworks when launching them. When I launched them on the riverbank , it felt like the fireworks were almost directly above me . This certainly makes for an impactful experience tour, and I hope I can convey that effectively in the video that follows. However, since creating fireworks naturally involves handling a large amount of gunpowder, safety precautions were taken when creating the No. 4 balls, and the tour moved far into the mountains to a workshop surrounded by thick concrete walls in accordance with regulations. To prevent fires, lighting was not permitted in the mountain workshop, so the work took place in natural light. As we traveled along the long mountain path, the feeling of being in a secret hideout grew, and the excitement rose! The tour began with a lecture on the basics of fireworks, then moved to a workshop in the mountains to create No. 4 balls. After returning to the workshop , we received a lecture on sparklers, made some sparklers, and finally launched them on the riverbank. The sparkler segment included tips on how to make the fireballs larger and longer-lasting, and when we tried them out, we noticed a significant difference. This tour may also be useful for enjoying sparklers at home. The highlight of the tour was the process of filling the No. 4 fireworks with gunpowder , but the explanation of how the launch works before the launch was fascinating. While there are many opportunities to see fireworks, it’s rare to see the launching process in person and receive an explanation, so we ‘ve included a video with detailed audio commentary for this as well, so please look forward to it! Incidentally, on the way from the workshop to the studio, we spotted a mysterious space . When we asked, we found out it was an observation deck built as a hobby by the mountain owner, and it was listed on Google Maps as the “Heidi Swing with a View of Mt. Fuji. ” It looked interesting, so we stopped by, but since it was just a swing tied to a tree and the weight limit was questionable, I didn’t get on, and Umami-chan tried it timidly! We were surprised to see inbound tourists ahead of us, even though we were in the middle of the mountains! We’ve also included a short video . Now, please watch the videos of each part of the tour in order. This is called “Wa-bi.” These fireworks are from the Edo period, an era before the vibrant, flickering fireworks we see today. The launch methods were quite limited, so rather than the today’s timed, explosive fireworks, these were rather unique, slow-fired displays known as “wabi.” This is what you’ll experience today. The fireworks you’ll make today will be these No. 4 balls, about this size. Finally, as the final program, we’ve prepared about 25 fireworks featuring only wabi . It’s likely the entire place is reserved for us today, since there’s no one on the river. There’ll be just us and, well, a few deer. There are quite a few deer, but no bears. This is the kind of program I’d like to go with . First, let me briefly explain what wabi is. The history of gunpowder is crucial when discussing wabi. Matchlock guns and gunpowder technology were introduced to Tanegashima during the Sengoku period, and as the Sengoku period began, the use of guns increased. At that time , the gunpowder used to fire the bullets was called black powder. So, what is black powder? Here are the raw materials for black powder: an oxidizer, a combustion improver, and charcoal. Mixing these three ingredients creates what’s known as national color gunpowder. This black powder was used during the Sengoku period. Then, during the Edo period, wars ceased and we entered an era of peace. In order to preserve the technology of gunpowder for future generations, decorative fireworks were developed. However , since black powder was still used as an ingredient, it contained charcoal. It’s said that fireworks from the Edo period only produced orange charcoal sparks. Then, during the Meiji period, Japan lifted its isolation policy and introduced what were known as metal compounds. These compounds, often known for their flame color reactions, produced certain colors when burned. By mixing metal compounds with the oxidizers and combustion improvers used up until then, various colors of light could be produced. For example, if you mix strontium carbonate to produce a red color, it will produce a red color. Adding copper oxide produces a blue color, and barium nitrate produces a green color. To make purple, you mix the strontium carbonate used for red with copper oxide to produce purple. Importing metallic compounds allowed for the creation of vibrantly colorful fireworks. At this time, in an attempt to distinguish between traditional and new fireworks , the terms “Japanese fire” and “Western fireworks” were born. Japanese fireworks are traditional charcoal fireworks used since the Edo period, while Western fireworks are vibrant fireworks containing metal compounds. These are how they are defined today. So, Edo-period Japanese fireworks. Not just skyrocket fireworks, but also sparklers and, in Mikawa, hand-held fireworks like these, are also a type of Japanese firework. Japanese fireworks were enjoyed in various forms, including hand-held fireworks. Next, before you make your own fireworks, I’d like you to learn a little about the structure of fireworks. By the way, this is a 10-go size firework, also known as a shakudama. It’s a firework that opens roughly 300 meters. This is one cut in half. Basically, fireworks are made up of three components before they explode into the sky . The first is what’s called the star, which is the round grain around it . The second is the small black grain inside the star, called the wariyaku. And the third is the fuse. These three are used. I’d like to briefly introduce each of them. First, the star. What is it? It’s a grain of gunpowder that burns and emits light. It’s made by shaping powder gunpowder into a ball. This star develops color as it travels into the distance, and the color that appears is what determines the firework’s true color. For example, a red firework is made by shaping red gunpowder into a round star, which burns to create the red firework. Blue fireworks are known for their blue stars that can be seen with the naked eye. Nishiki stars contain metal, creating fireworks with trails like this one. So, these stars are the true essence of fireworks. The second is called wariyaku. It’s made from rice husks. Wariyaku is made by sprinkling powdered gunpowder on top of these husks. The role of wariyaku is essentially to make a colorless firework. So, what role does it play? It explodes the firework, sending the stars flying far outward. When lit, it happens in an instant, like this. Using this expansion force, wariyaku lights the stars and sends them flying far away. As for the fuse, I’m sure you can all imagine it. It’s a tube filled with gunpowder, and when you light one end, the fire travels up the tube, finally emitting a pop at the end. So, there is a simulation of how each of these elements work together. First, there is a firework tube, and the gunpowder used to launch the firework is set underneath it. When a spark is thrown into this tube, the gunpowder used to launch the firework first ignites. Once lit, the ball flies into the air, and at the same time, the fuse ignites and flies upwards. Once the ball reaches the right height, a fire is ignited in the center of the ball, igniting the explosive, and the expansive force of the gunpowder causes the stars to burn and fly away. This is how fireworks are structured. Then, by calculating the distance it takes to launch to the right height, the length of the fuse is adjusted… Well, by adjusting the length of the fuse, it’s said that the best height is when the ball flies into the sky and then descends . The time is adjusted. Can the launch speed and height be adjusted? Yes. The height and speed are controlled by the gunpowder used for launching, as you just saw. If you put in a lot of it, it will fly extremely high. So, for larger, heavier balls, you use more than twice the amount of gunpowder than smaller balls to launch them into the sky. Is there a general idea from experience that the amount of gunpowder needed for a certain size ball is about the same? Yes. We do a lot of test firings, and we actually test, in 1g units, to see how much is a little low, how much is just right, and then we try the actual fireworks. You know, the Japanese fire also has a bit of a lingering aftertaste, don’t you think? Does it still leave a tail even though it’s made with black powder and no metal? Yes, it does. The Nishiki fireworks we saw earlier contain metal, so the metal burns as the stars burn, creating a sparkling tail. Japanese fireworks, on the other hand, are made with charcoal . They contain coarse charcoal , which scatters as it burns, leaving a tail. So it’s different from the red of strontium. Yes, it’s the color of charcoal fire . When you draw charcoal and it pops, the charcoal sparks come out just like that. Regarding your question about charcoal, I’d like to delve a little deeper. Japanese fireworks don’t come in a variety of colors. Since they’re monochromatic, they’re a little lacking compared to Western fireworks . But because we can’t achieve color variation , we can create variety by tweaking the burn time and the amount of sparks that remain . For example, you can change the ratio of saltpeter to charcoal to change the combustion . These are all the same-sized stars, but the Chrysanthemum type contains 6 parts saltpeter and 4 parts charcoal, the Crown type contains 5 parts saltpeter and 5 parts charcoal, and the Willow type contains the opposite , with less saltpeter and more charcoal. Chrysanthemum fireworks burn faster because they contain more saltpeter. When they burn faster, they look like this. Next, we have the Crown type. These contain about half saltpeter and half charcoal. They burn a little longer. As you saw earlier, when the burn time is extended, they become a bit more droopy. And finally, we have the Willow type. These contain a lot of charcoal and burn even longer , more slowly. These are not the Willow type fireworks that open , but rather burn for a long time and are more of a showpiece. First, we vary the ratio of these ingredients to create a variety of variations. And again, from another angle, the charcoal grain size and the amount of sparks that remain also play a part. There are very fine charcoal and slightly coarser charcoal. I mentioned metal earlier, but by adding this coarse charcoal, the fire extinguishes, leaving a few sparks behind. I’d like you to take a look at this. With fine charcoal, you open it up with a pop, then pull it back a little, and it quickly disappears. On the other hand, if you use coarse charcoal, it’s a subtle difference, so it’s a little hard to tell, but after it opens and leaves a trail, a few sparks slowly remain and then it disappears, creating this change. You can also change the arrangement of the stars when packing them to create a flower called a “happo,” or a firework called a “senrin-kiku,” which has even smaller balls inside one another. These “senrin-kiku” fireworks can also be made using Japanese fire. So, by skillfully combining the mixture ratio, charcoal particle size, and shape, you can create a single-color firework, but the unique feature of Japanese fireworks is that you can add various variations to it. It looks like this. These fireworks are single-colored, but they can be decorated with dramatic effects. Today’s starmines also contain various things, such as the crown, chrysanthemum, and willow that you just saw , so I hope you will take a look and enjoy them. As I mentioned earlier, is there a difference in the way the stars are packed between the ones that spread evenly and the ones that have spots? Yes. The difference between the willow and chrysanthemum I mentioned earlier is that the chrysanthemum has a breaker inside, so the stars fly outward in a round shape using the power of the breaker. Is it like the photo? Yes. On the other hand, willow fireworks don’t have a breaker inside the ball. So instead of bursting open with a bang, they pop open in the sky, releasing only the stars. That’s the shape. So it feels slow. Yes. Without the breaker, are the stars only packed on the outside and the inside empty? Ah, the inside is packed with stars. It’s packed with all the stars, so it doesn’t move. There are a few other things here. Ah, all of these are the ones I mentioned earlier. Yes. So, we stock all kinds of charcoal with different particle sizes , and then we add and blend the charcoal that suits our purpose. Wow. Does it smell like this? Yes. Yes. It smells a little dangerous… Does it smell dangerous? lol So, let’s move on to the next step. Do you adjust the size of this thing yourself ? I mean, the size, or how fine it is? That’s right. It depends on the size of the holes in the sieve . Ah, I see, I see. It depends on the size of the holes . Next, we shape the powdered gunpowder into a ball . Since we use charcoal, it turns completely black. We use a kettle like this . This has a power outlet at the back, and when you turn it on, it spins around. So, to make the stars, first we make the powdered gunpowder into round granules about this size. Then we knead the powder into a clay-like substance, and we pass it through a sieve with large holes, rubbing it like this, until it becomes about this size, and then we spin it around to shape it into a ball. So, from there, I’ll demonstrate it by using this as a cauldron . It goes like this. Like this. The star is moving around as it spins around, but first, we make a liquid called “Toro” by dissolving powdered gunpowder in water. We apply this to the surface of the star like this . Like this. So the surface gets wet. This is already mixed powder. Gunpowder powder. We sprinkle this on the surface like this. Then, we roll it again and it starts to grow. It grows 0.1mm. We repeat this process five times each time. After repeating this five times, we dry it in the sun to let the moisture evaporate. All right! Then, once it’s dry again, we apply the powder and sprinkle more again in the same way, and it gradually grows. That’s about 0.5mm per day. That’s about 3mm. It takes about 3 to 4 weeks to grow to about 20mm from here , and if it’s sunny every day and you can work on it, it will be completed in about 3 to 4 weeks . This is harder than making sugar candy. Yes. And, for the wariyaku, you put rice husks in this in the same way. Once the gunpowder is applied and then coated with powder, it’s complete. Incidentally, stars made overseas are shaped like this. Yes! Yes. Actually, powder gunpowder is packed into a pipe and compressed, so it can be made to this size in an instant. But why do Japanese people use these round stars? In Japan, there are stars called “changing stars,” which I think change color along the way, but these stars don’t change color . Stars burn from the outside in, so if you have a star that changes color from red to blue , you first make it this size with blue powder. Then, if you cover the top with red powder, the red burns from the outside, then the blue burns , creating the illusion of change. So, we make these round stars for changing stars . This is the star and the process of dispersing the powder. Is this the most time-consuming part? Yes, it is. And, it can’t be done unless it’s sunny. Another tricky part is that you have to keep sprinkling the water and powder in the same way, otherwise it will become distorted, so it requires a lot of attention to detail. They make loads of these, right? That’s right. Some days are sunny, but humid. On those days, they’re exposed to the sun for longer. They do dry out quickly in the summer, but on the other hand, they dry out all at once, so they can crack, which makes them a little tricky. The drying method has a big impact. You might not be able to tell which color is which. That’s right. Western fireworks have slightly different powder colors, so you can tell, but if two stars of the same size get mixed in by mistake, it’s hard to tell which is which. We take great care with quality control, or labeling. For example, if a late star gets mixed in with a fast-mixed one, it will disappear and then be the last one left. We’ll just have to be careful about things like that from now on. There’s a foreign object in there , lol. Sometimes, with colored fireworks, there’s one red firework with a slightly different color mixed in, or it pops out at the end . Once it’s complete, we assemble each part here. Let’s get started. This is the star. And the breaker. We’ll use something called a ball skin. It’s pressed cardboard. In the past, we used to make molds by pasting newspaper onto a wooden mold, but now we use something like this. This part over here is the fuse. If you look in the middle, you’ll see a small black area, which is filled with gunpowder. When you light the end, it goes through the tube and finally ignites the inside. First, please remove this half skin with the hole. This is the fuse. Hold the non-yellow end and insert it into the hole. It’s a bit tight, so please insert it slowly while turning it. Turn it around and around. Insert it all the way in. Then, place it on this stand. This is rotated on a potter’s wheel, so you can work on it while it’s rotating. First, we’ll make the stars. We’ll line up the stars along this cup. I’d like you to line them up carefully so they don’t harden. We’ll line them up about 80% of the way up. We’ll adjust the gaps later, so please leave some space. Once you’ve raised it to about 80% of the height, add the small half-skin that you just removed. Please insert this firmly. I think it’s easier to start from a low position, so once you’ve inserted it at about 80% or 90% of the height , it’s time for this pot lid. I’m using the large pot lid on the left here. So, lightly tap it from above once with the large pot lid . I think it’s best to start from a low position. Then, tap it and check, and then insert another star where there are gaps, and tap again. The stars move more easily with finer vibrations, so rotate it a little. Tap while rotating the bottom, and the whole thing will move. From here, you can adjust the height of the stars while filling in the gaps. Even if you think they’re lined up nicely, if the stars are too high, for example, when you line them up halfway, there will be a gap in the middle. We want to be careful about the height and also fill in the gaps on the surface. If you think there are too many stars, have them remove one and hit it. It looks like they can add another. This is where the amount of adjustment varies depending on the maker . For example, here’s one side. If you hit only one side, the excess will come out, so you can remove that and make the height even. How about just moving this part a little? Also, this part is a little high, so it looks like it could be raised. It might also be okay to adjust the other side lower. The part that sinks in has a gap below it, so it looks like you could adjust that gap by slightly shifting the layer below that . Yeah. Is this getting in the way? Yeah. This is delicate. The height changes depending on whether one star really fits or not. Now, I want to pull out the inner cup, so press both fingers outward on the cup and pull it up. Okay. Next, we’ll use this paper. It ‘s two sheets now, but open them all up , stack them together, and I think you’ll find the center point. Yes. Press this area with your fingers like this, and then with your other hand, make a small circle and squeeze upwards . This will create lots of vertical wrinkles. Once you think you’ve created wrinkles, take one piece of paper. Place it on top of the small half piece of leather you used earlier, aligning the center. Once it’s on, lift up the paper and cup together and tuck the paper inside. Now, this side has the fuse attached , so use scissors to widen this hole a little and put it back inside. Now, spread the paper out, hold the cup inside with your hand, and spread the paper outward. Then pull out the cup. Now there’s a space in the middle, so you can start by filling it with the medicine. You can put in quite a lot, so start by just covering the top of the fuse . Put in plenty . Enough to cover the top of the fuse. Okay. Next, lightly tap the icing with a small pot lid. This will also vibrate gently , eliminating any gaps, so continue tapping lightly to pack it in. If the top of the fuse is still visible, add more icing. There is also a guideline for how high to add this icing. Now, I’d like you to pay attention to the sound. When you tap the star, it makes this high-pitched sound. When you tap the icing, you should hear a bit of a crunching sound. Then, when you tap the whole thing with a large pot lid, you should be able to hear the high-pitched sound of the star and the crunching sound of the icing at the same time. Ah, that’s good. The sound is just right now. If you adjust it and only hear the sound of the stars, add a bit more icing. をクリアしましょう！英語: Then, once it’s the right height, have them place the lid on it and lift the ball with both hands. Then, while holding down the lid, lift it up. Then, while still holding it down, gradually push it down, and the vibration will cause it to drop again. Now, check the sound once more. Yes. It’s good. If it’s the right height, it’s OK. Yes. It’s good. Okay. This completes one side. Once you’re done, please move it to this transparent stand. Try making the other side in the same way . If there isn’t enough powder, a little space will form inside and the star will get smaller. If that happens, one star will go too far in and not fly, so it’s best to fill it with powder properly to make it fly nicely . However, if the powder is too high, there will be gaps. Ah, I think it’s good. I think it looks good. It turned out nicely. Then, finally , we’ll align it, and to align it, I’ll show you how to do it here, hold both in your hands and hold the fuse between your fingers. It’s difficult to align them horizontally , so start from a slightly tilted position. Also, without a fulcrum, they’ll shift when you align them, so for example, have them rest both on your fingers and use that as a fulcrum to work their way towards the center, or you can slightly place one edge of the cup on the other edge of the cup to align them. I think it’d be a good idea for you to practice a bit. About that angle. That’s right. Use your little finger as a fulcrum and bring it all the way to the center. Oh, good job. Amazing. That’s difficult. If you do it too slowly, it’ll do the opposite. If your thumb gets in the way , they won’t stick together. I think it’s better if your thumb doesn’t stick out here. The angle should be a little more. About that. Wow, that’s good. Let me try it out. Put it on the fuse. The paper gets in the way, so hold it down with your little finger like this, and on the other side, hold it down with your little finger like this , so there’s a slightly protruding part on this side and a slightly recessed part . Try to find that spot and align it nicely while holding it . It’s fine whether the fuse is on the left or the right. That’s difficult. I think it’s probably fine. I’ll give you a little support, so, um, let’s go one at a time. So that it doesn’t end up being a disaster. This one’s kind of difficult, isn’t it? It’s scary. This is quite difficult. It’s a bit scary . This is quite difficult. It’ll be fine if you make it a little more slanted. Attach a little more paper. Just a little more. Just a little more. About this much. It’s difficult. Oh, it’s okay. Oh, it’s fine. We’ll hit it a little more from here to sink it , so I think it’ll be fine. It’s okay. That’s right. Well, it’s fine as long as it’s easy to hold. Wow, this is difficult. Oh, and then do you want to tape it? Paper. Right. That’s right. So, make it quite slanted. Yeah. Place the fulcrum on your finger. I’m placing it on the cup. Oh, that’s right. It’ll be fine if you angle it a little more. Right. About there. Going. Wow. Perfect. Oh, that looks good. Then, there’s still a small gap between the balls, so I’d like you to lightly press down from above like I did just now. First, rotate the top lightly, also using vibration. Once you’ve made one full rotation, press down on the underside of this ball. While rotating , gently pull the paper outward . Yes. That’s okay. Then, finally, use scissors to cut off the excess. Insert the blade along the cup. Oh, that’s good. The length is good. The balls are a little off-center right now, so move them to one side. They’re a little off-center. It’ll crumble. It’ll crumble. It’ll crumble. That’s right while pressing down. Yes. Then, finally, the finishing touches. From above again, trace the paper with your finger like this. While pressing down from above, trace the paper with your finger a little. Yes. You should be able to feel a gap when you trace it with your finger. Next, when you find a gap, tap the seam. Press down on the top quite firmly, and when there’s no gap, shift it a little, and if there’s another gap, If you press down firmly from above like this, and then tap it further in this state, you can trace the gap with your finger and if there are no gaps or protrusions, it’s OK. If it’s not sticking out too far, it’s fine. Then the last step is this tape. Wrap this around it twice while pressing down from above. While pressing down firmly, pull the tape as you wrap it. Yes. This is finished. How do you like it? Does it feel more solid than you thought it would ? Now we’re going to attach paper to the outside to strengthen it, but due to time constraints, I’ll do it myself. If you mark it, anything will do , right on this fuse, so you can tell it apart. Yes. This is finished. Yes. Thank you. First, I’d like to briefly explain: Are you familiar with these types of fireworks? Yes. This is actually what sparklers get their name from. They’re made by attaching kneaded gunpowder to the end of a thin piece of straw and letting it dry. In the old days, people enjoyed incense by placing them in an incense burner and lighting them with the gunpowder facing upwards. Since the gunpowder was on top, it was like incense… right? That’s how they got their name, incense fireworks. There are these different types. The ingredients for incense fireworks, as I mentioned earlier, are a type of Japanese fire, and they’re basically potassium nitrate, sulfur, and carbon. However , in the case of incense fireworks, instead of charcoal, they use soot. This produces what’s called gunpowder smoke, and it’s made from pine trees like these. Burning pine trees that are covered in oil or pine resin creates the soot. I’d like you to take a look at this video to get a sense of what they are . First, we start by collecting pine trees that are full of resin. We get permission to do this on the shrine grounds. Since pine trees that have died due to pine-eating don’t naturally have any resin, we naturally look for these types of pine trees. We then extract only the oily parts . When you light it, it contains a lot of oil, so a lot of black smoke comes out due to incomplete combustion. This smoke is collected, and there is a method called shoji-taki, in which a small box is made and shoji paper is pasted all over it. The wood is then burned inside , and soot adheres to the shoji, which is how it is created. It is left to simmer for about eight hours a day. This is the soot. This video shows it after about six hours . There is soot on the ceiling, and when you scrape it off and collect it, it looks like you have removed quite a lot, but because it is fluffy with soot, you can only remove a very small amount by letting the air out, so it is a valuable raw material. Domestically produced sparklers are essentially made with gunpowder smoke, while those made overseas, like in China, are extracted by burning industrial oil. If you give them a whiff, you’ll really smell the soot. It’s amazing. It’s the same as incense. That’s right. I also often recommend this rosin, and it has a wonderful scent. Try sniffing the shavings. It’s amazing! Fresh! It’s like the scent of fresh fragrant wood. While fireworks tend to have a strong scientific image, Japanese fireworks are unique in that they are made from natural ingredients like these. I’ll also introduce a secret to their longevity, which is sometimes featured in the media. Most people hold incense sticks straight, but if you let them hang down straight, the fireball will be supported by this single point. You raise it at a slight angle . This slightly increases the surface area the fireball touches, making it less likely to fall. I’d love for you to try this out, too. Next, I’d like to move on to the production process. There’s a key point. To put it simply, we ‘re going to wrap the powder gunpowder in paper. The key is to wrap it tightly and tightly. If you wrap it tightly, it will be compact , but if you wrap it loosely, it will become loose like this . So, how does each type burn? First, if it’s wrapped tightly, it will burn slowly, creating a fireball from the bottom . Gunpowder burns vigorously using oxygen as fuel, so pushing the air inside the gunpowder outward will slow the burn. Wrapping it this way produces sparks, but if it’s wrapped loosely, for example, a gap or layer of air will form between the paper and the gunpowder , and the oxygen will make it burn more violently. It might even fall off. I’d like you to keep this tight wrapping in mind as you go along. Why do handheld fireworks burn quickly, while sparklers form balls? Probably because they contain a lot of sulfur. The temperature when they burn is roughly 850°C. From there, the chemicals react and the temperature rises to about 930°C. When this happens, the fireball gradually begins to boil. It’s like a pot of hot water bubbling away . A similar phenomenon occurs on the surface of this fireball. When it starts to bubble, parts of the fireball fly outward, react with oxygen in the air, boil again, branch out, and break down into smaller pieces . Next, we’ll use this spoon. It’s a measuring device, and when you pile it up and level it, you get exactly the amount of gunpowder needed for one stick. If there’s too much gunpowder, the ball will be heavy and will fall , so make sure to level it out thoroughly. If there’s too little, it will affect the sparks, so if you want to make it properly, you ‘ll need to return it to its original state in one go. Next, take the paper inside the envelope. Sparkler paper is very thin, but you can pull it quite hard horizontally. If you look at the red area, spread it out a little to create a bag, and drop the gunpowder into it. Then, tilt it a little to the right. It’s difficult to work with if it’s too piled up, so like this. And, this is a non-slip powder, so I think using it will make the process easier. First, take the thumb and index finger of your right hand . Look at the bottom right. Instead of pressing from the side or above, close your arms and press down from the bottom upwards. Then, with your other finger, press down on the very bottom, just where the red and white lines meet, where the fold is. Once you’ve pressed it down firmly, pull the paper tightly until horizontal wrinkles appear. It’s okay to pull quite hard. Then, while still pulling the paper, rub your right thumb diagonally up and to the right, twirling it around and rolling it. Rub it up and to the right, pulling it . By rolling it while pulling it, you can roll it tightly, so keep rolling it while keeping it taut. Once you’ve rolled it up to the top, turn it a few times like this and squeeze the base. This will let the air out again and it should start to harden, so keep squeezing. Next, while still holding it down, slide your left hand slightly to the side. Then, while still pulling the paper, push your thumb out again, pulling it out. Push your right hand out. Just when you think it’s going a little further , move it a little to the left again, pull it again, and push it out again. Then move it a little to the left again, pull it again, and push it out. Repeat this until you reach the top and it’s finished. Then, when it’s cooked through… Oh, it just starts to cook. So, this goes in here, and this is the one hanging outside , and with the fireballs in there, it’s lit. It’s set up so that electricity flows through the customer line , and when you click the electricity through here, a spark comes out. Ah, and it ignites in an instant. That’s right. It’s set up, so this is a module with a bus line, and there’s an ignition key over there, and if you press the button there, if it’s number 1, it will power number 1. Oh, I see. Then, move a safe distance away… I’m going to put the fireballs in now. I’m so glad you got to see this. All right. This is the setback. Ah, so this means we’re going to rip the lid off. That’s right. We’re going to rip it off. Then we’ll go a little further away and do some sparklers and hand-held fireworks, and then we’ll launch some fireworks. And then we’ll start the countdown for the first one. Five seconds before. 5, 4, 3, 2, 1, ignite. It was so round. It was amazing. Beautiful. And now we’ll do the second one. 5, 4, 3, 2, 1, ignition. Wow, amazing. Oh. Oh, so nice. So nice. Amazing. Amazing. It’s right above. Perfect. Amazing. Perfect. Round and complete. Amazing. And now for the final program. I’d like to start five seconds before. 5, 4, 3, 2, 1, ignition. Wow. Wow, wow, wow, wow, wow. Wow. Oh , that’s a little different. Wow , so beautiful. Wow. Wow. So beautiful. I can’t believe I can see it so close. It’s right above. Wow, amazing. Wow, amazing. Wow, amazing. Wow. Hohoho. Wow. Amazing. Amazing. Wow. Oh, wonderful. Wow. It’s amazing. Did you enjoy the video of the No. 4 ball making experience? It was a great experience, learning how to keep the sparkler fireball large and learning some fun trivia about fireworks. It is only held outside of the summer, but is also recommended for people from overseas. See you next time.
*Enjoy English subtitles from “setting” button
花火は見るだけのものと思っていませんか。
今回は前回の賛否両論に続いて、Otonamiが主催するツアーで、打ち上げ花火の作成体験をしてきました。手持ち花火や線香花火は火薬量も少ないので、お子さん向けの体験もあったりしますが、ここはソフトボール大の4号玉サイズに火薬をミチミチに詰める本格的なやつで、18歳未満は参加禁止とのことです。
今回のツアーでは、山梨県の丸富工房で「和火師」の佐々木さんにお世話になりました。金属片の炎色反応で色を出す西洋花火とは違い、黒色火薬のみの味わいを楽しむ、とっても日本らしい「和火」の職人さんです。和火と洋火の違いや、打ち上げ花火の仕組み、線香花火を長続きさせるコツ等、講義の動画と併せて、最後の打ち上げ花火の動画もお楽しみください。
山梨県の山中にある、「富士山が見えるハイジブランコ」もちょっと紹介していますよ。
#打ち上げ花火作成体験 #4号玉を作る #打ち上げ花火の解説 #打ち上げ花火の仕組み #線香花火を長持ちさせるコツ #富士山が見えるハイジブランコ #打ち上げ花火の動画 #打ち上げ花火の作り方
