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多分意味のない工程があっても気付かない自信はある

Okay boys and girls, curious people of all ages, let’s break down what this madman did this time. First of all, I am not an expert in arthropod exoskeleton chemistry, even with seven billion people on earth there’s probably not more than a handful of such weirdos. But I have a decent understanding of biochemistry and can read wikipedia. So what is Chitin ? Long story short, it’s like cellulose, a long polymer of sugar that plant cells use to make walls. But unlike cellulose chitin is made by animals and the sugar monomers are slightly modified for extra resistance (= lighter for equal strength) because animals have different issues than plants. Anyway, chitin in its pure form is supposed to be translucent, so he’s trying to clean the crab shell from anything that is not chitin to at last have a decent see-through crab. never thought i'd say that one day. How will he do that ? First he presents to us his magnificent ozone machine : ozone is chemically speaking O3. You know that oxygen from the air (O2) tends to oxidize stuff right ? Well O3 is the much more aggressive version of that, don’t breathe it I guess ? As far as I know the main way to obtain ozone is to generate an electrical arc, like with a Tesla coil or something, I don’t know how his machine works but I assume it generates the ozone in its casing and then just bubbles it in the water, pretty sure it is not made _from_ the water. Now, generally speaking in the living world, color is obtained through pigments : small molecules that often have a cyclic structure. An other possibility is through the use of metallic ions (like in your blood, provided you have some) but then the color is rarely the obective. Anyway, those pigment molecules are somewhat fragile and a good way to destroy them is to use an oxidant. That’s what he demonstrates when bubbling ozone in the orange water : the color disappears. So he does that with the crab shell, there’s no before/after picture so it’s hard to tell how effective that was. As an added benefit, the oxydation probably helps destroying some unwanted organic trash on the shell. Next he takes some magnesium metal and puts it in water. From its native state, Magnesium needs to get rid of two electrons to have a nice smooth outer electronic shell, and it will gladly give them to water. So the reaction is Mg + 2 H2O → Mg2+ + 2 OH- + H2. Thankfully magnesium metal is not as angry as sodium or Potassium, that straight up explode in water. Kiwami gets to live an other day. The important part here is that this makes the solution extremely basic (the OH- part), that would be pretty aggressive for your skin and that’s the point : boiling the crab shell in that stuff will completely ruin most proteins and whatever else is in the shell. Being basic also will saponify any oils and fats that may be present (long story short : make them water-soluble) for extra cleanliness. Chitin is largely unaffected by that because of complicated reasons. That worked pretty well, anything that had a color was completely destroyed, now the shell is a nice clean white. But it’s completely soaked with caustic soda, so he boils it in clear water to wash it. By the way, the reason he boils it is because that makes it easier for things to diffuse in and out of stuff, you could cold-cook pasta if you really wanted, the water would eventually find its way into the noodle but it’s inefficient and kind of gross. He then checks with the pH paper which returns neurtal. He then prepares a bath of citric acid to clean the shell even more. Citric acid is kind of “mild” with a pH around 2, in a way it is the opposite of the previous step, except boiling something in strong acid would dissolve pretty much the entire thing by attacking the O links that binds the sugar monomers. I don’t know exactly what he hopes to get rid of with that, there is some sense in assuming that was wasn't destroyed by the base may be sensible to acid, but I don’t think hot lemon juice constitutes a proper acid hydrolysis. however I wouldn’t be surprised if the exoskeleton of a crab was calcified (CaCO3) at some extent. I guess that would explain the white color. If that is the case, yes, an acid bath would dissolve the calcium carbonate. That sort of works, whatever the point was, but is not enough. So he prepares this time an hydrocloric acid bath, that is chemically almost the same but stronger. I checked online and while boiling acid would definitely dissolve cellulose, well... chitin as we said is slightly more resistant. Also time and temperature are important for this type of reactions, note that he doesn’t actually put the thing to a boil but "only" at 80°C (176°F for people who can't have proper units). This time the shell it is much clearer, I don’t know exactly why there is almost an entire layer worth or crab dandruff detaching, maybe it’s made in layers in the first place. The issue now is that the crab shell seems extremely weak and soft. The beige-ish thing is collagen powder to make gelatin, he cooks it as intended and then coats the crab with it. That will both reinforce it structurally, and give it some sort of polish because rough surfaces are not compatible with being see-through. I’ll skim very fast on the sodium alginate part to make the eyes of the crab, calcium causes sodium alginate to turn into a gel, so if you have drops of that stuff fall in a high-calcium solution, the outside of the drop will gellify, giving you a nice round bubble of alginate, it’s a pretty well known food chemistry experiment, typically to make fake fish eggs like caviar. He puts the eyes in place, puts the shell back on the crab and behold ! The most beautiful crab in the world ! But no matter how magnificient of an abomination he just build, that is not even remotely as see-through he had hoped, so it must be crushed, destroyed, annihilated, and tuned into a “knife”. it is thus blended it to a powder, and boiled. Now remember that chitin is a polymer, therefore it makes strands. Blending it like a maniac will at best give you slightly shorter strands that regular blending but you will still have strands of chitin swimming in that soup. If you put that in water and heat it, this whole mess of threads will tangle and form some sort of gel, and if you dry it hard enough this will result in a very strong material (that is always the same basic principle that allows him to make knifes from wacky shit). So he makes a pellet out of the shredded-boiled purified crab keratin and sharpens it into a better claw for the crab. Too bad he doesn’t have a shell to protect his brain now ! Ha ! Lol, no I’m joking ! arthropods have their brain and spinal chord on the belly side.

その工程を踏めば甲羅が透明になるなんていう知識、何をどうしたら身につくんだｗｗ

He's the legendary NPC who makes weapons from the monster parts you give him

時間かけて透明にした甲羅を早々に破壊するのめちゃくちゃサイコパス

海外の方々、勘違いしてるかもしれませんが、別に日本語がわかるからってこの人の動画が理解できるわけじゃありません

1番大事そうな殻1枚犠牲にして最強のハサミを手に入れたカニ

久しぶりに見に来たけど、相変わらず元気そうで良かった

しばらく動画投稿ないからどうしたのか心配だったけど、カニを煮ていたんですね。いつも通りで安心しました。

普段からどういうモチベーションで生活してるのか1ミリも想像できないKZfaqr No. 1

This man is a real life mad scientist. I feel like his real life job must be high school science teacher and this is how he gets his students interested in science.

there's always wild stuff happening in kiwami's videos but the wildest part is always the times when he puts a ton of time and effort into something and then just destroys it

hello everyone, welcome back to _"is he doing this step for no reason or not?"_

あんだけ煮たりなんだりされても形を保ってる蟹の甲羅すげーなって。

i’ve been watching his videos for 2 years now and it was just at this right moment that i realized that many of the knives he made (if not all of them) can pass through weapon detectors carefree... i don’t know if this information will let me sleep peacefully tonight

When life gives you lemons you make it into a knife.

視聴者になって結構経ったけど未だに何してるかわからないし、なんで見てしまうのかもわからない

包丁の人なのに包丁にする過程尺短くなってて笑った

切れ味良すぎだ…😂透明で綺麗だなぁ…✨

If anything exists, this man can make a knife out of it

カニを透明にするだけでも1本の動画になるのに、そこから包丁作り出すのは狂気の沙汰

なんなのかさっぱり解らないけど、最後に包丁になる確信だけ生まれる

I want to know what goes through a person's mind for them to wake up one day and tell themselves "I'm going to make a knife out of a crab".

Normal people: “Man that crab looks pretty tasty I must admit.” Kiwami: “This *c r a b* would make a great knife.”

なかなか新しい動画投稿されないなって思ってたら2ヶ月もカニ茹でてたとか誰が想像できる（褒め言葉）

カニも2ヶ月間殻を煮込まれて包丁にされるなんて思わなかっただろうな

めちゃめちゃ綺麗…

ガスコンロの付けた時の音好きだわ

5:59人形の髪が伸びることで時間経過を表現されても怖いだけです

まさかカニさんも死んだ後に甲羅が透明になったりナイフになったりするとは思ってないやろな

I thought you were my favorite knife maker on youtube, but it just dawned on me. You're my favorite chemist.

My heart when he crushed the perfectly clear crab in the vice!

使ってるハンドミキサーが一緒で湧くはずもない親近感が沸いた

私が2ヶ月ボーッと生きている間、不審者はずっと蟹を煮ていたと思うとゾッとするよね

I love the sound of his stove turning on

かっこよすぎる

外国人用の題名にしてるから日本人には理解不能なの草

動画の8割何をしているか理解が追いつかない

この人の動画は動画も面白いけど、コメントもなかなか面白い。

そろそろ3ヶ月だから新作動画出してくれるんじゃないかと期待している

いつも訳分からん内に音フェチ効果で寝落ちして起きると包丁が出来てる(？)

I love that this channel about knife making has gotten to the point that the making of the knife itself is secondary to literal chemistry.

3:21 久しぶりに見に来たらおぞましいものあって草

何をしている工程なのか全くわからないが 最後まで見ていると意味がわかってくるのが面白い。

いっぱい手間かかったカニが透明になって目まで付いて、可愛い！凄い！って愛着湧いてたのに潰されてリアルにえっ…て声出た

これだけ日本人コメント無いとさすがにビックリ

I swear this guy is an amazing chemist with a cool job and does this when he comes home from work lmao

だいぶイカレてんな… と思ったけど、ウチの電子レンジと全く同じやつで 一気に親近感湧いたww だいぶ年季が入ってる筈なのにずいぶんと綺麗に手入れしてますね、 東芝ER。 感心したので登録します。

人形の首を曲げて起動させるの変態過ぎて好き

蟹を飾る→わかる 2ヶ月間煮る→まぁわからなくもない 透明になる→よくわからない 包丁になる→わからない

this guy literally has every type of machine for every type of work

チキンナノファイバーって新素材なんだ このチャンネル最先端じゃん

カニを飾るため(？) 2ヶ月煮たら(？？？) 透明になって(？？？？？？） 包丁になった(？？？？？？？？？？？？)

cons: no more protective carapace to protect essential organs pros: new sick-ass claw that all the other crabs will be jealous of

静かに作業するから 睡眠用に適してる()

めっちゃ腕綺麗やなぁ

こんにちは。 私は日本人です。 このビデオは凄いです。 題名はいつも分かりません。

5:30 この ？ が何故かかわいい

I have no clue whats going on, in my head chemistry is throwing things together inna pot with a large wooden spoon, but I love the fact this channel has become a chemistry knife channel.

anyone think this person walks through life, observing their surroundings and thinking "I could make knives outta that"

カニを飾る→分からん 透明になる→分からん 包丁になる→？？？？？

海外ニキが、「死んだら俺でナイフを作ってくれ」って言ってて草生えた

これが鎧裂ショウグンギザミですか()

this guy can turn every material into sharp knives how wonderful

時間をかけて透明にしたかにの甲羅砕いた時「えっえっえっえっ？？？せっかく標本できたのに…」って思ったけどこの人の完成系は包丁だったことを思い出した

カニって透明になるんだ… すごい…

めちゃくちゃなつかしい実験器具が出てきたー

どんなに頑張っても気が付いたら包丁を作ってしまう千空

理科室でしかみたことないような道具が普通に出てきてることに今では疑問も抱かない

コンロに火つけた時リズム刻んでんの草

i love that in every video the first half seems completely random and unrelated to knife making and then it all makes sense in the end

よく分かんないけど毎回、牛さんの水差し欲しいなって思う。よく分かんないからASMRとして観てます

この人だけはこのまま変わらず不審者でいて欲しい

Netflix: Are you still watching? Someone's daughter: 15:09

6:39 wow... it looks 3D printed or something, it would be cool blanching and then reconstructing the crab with a new fantastic paintjob 🤔

なんだろう最初分からなかったけど、粉々にして水に溶かして火にかけたところから安心感を覚えた

同じ動画を見ることで、国も人種も性別も超えて「この不審者やべぇやつだ」という気持ちを共有できているなら、嬉しいものです 世界平和は包丁から始まるのかもしれません

Him : today, I will make a crab knife *proceeds to gently caress a shark model*

そろそろ時期的に次の動画が上がるぐらいだな

圧倒的不審者さんがちゃんと訳分からないことしてるの、安心するなぁ。

毎回思ってることなんだけど、この人の根気も技術ももちろんすごいんだけど、いろんな科学のお勉強をしてないと理解できないので、“素材”をどうやって操作したら硬くなるのかを調べたり考えたりして包丁にしてくのが凄い。

食紅を震えて混ぜる人形が怖すぎて笑っちゃうw

カニってこんなキレイに白くなるの...

蟹も死んでから、こんなに煮詰められると思ってなかったはず🦀🦀

毎回終始何してるのかわからないw 気がつくと刃物出来てるw

Love the knives you make! 愛

普通に凄い

透明になったカニを砕いた時、やめろおぉ！！って思った、、もったいないっておもった

this guy does things in the least, most effective way

彼の動画は２倍速で見るのが癖になる

いや気体検知管とかあったわ先生に高いから失敗しないでねって言われるやつ

I swear, he has the most exact and specific equipment I’ve ever seen

色んなみたことない道具出てくるし ウシ何種類かあることに気づいて繰り返し見ちゃう

I could watch him use different tools all day.

リトマス紙でアルカリ出た時「どれ？」ってなってるの面白い

2歳の娘がこれを見てました。 将来が楽しみです。

「なにつくってんだろ…」って始まって 「なにつくってんだろ…」で終わるasmr動画でした

Your videos always fill me with equal parts amazement and dread.

世界一愛される不審者