🧨 A goose quill cut extra long, so that no part of your hand comes near the far end of it. A pile at that end no bigger than a dime. The snap you hear when two people pull a Christmas cracker apart. And a toy children throw at the pavement to make it bang.
All four are the same compound, first made around 1800 by a man it injured in the eyes. Its name is silver fulminate, and in more than two centuries nobody has ever made it by the pound — it has never filled a shell, never filled a bomb, and has never once been produced by the ton the way TNT and RDX were. And the reason it can never be made in bulk is not the reason almost everyone gives.
This video is the whole life of that compound. It starts with a name, because the name is older than the substance: fulminating silver, in print from the early 1700s, with no exact chemical definition to this day. Johann Kunckel von Löwenstern described one in 1716; Claude Louis Berthollet prepared one in 1788. Neither was silver fulminate — both were almost certainly silver nitride, a different compound with a different formula — and detonator histories written by people whose day job is explosive ordnance disposal still get that wrong right now. The real thing appears around 1800, and even that is not a clean sentence: one source credits Luigi Brugnatelli in 1798, another Edward Charles Howard in 1800, a third Brugnatelli again in 1802. What is not in dispute is what happened to Howard. His work on the mercury salt ran in the Philosophical Transactions in 1800 and won him the Copley Medal, and when Sir Joseph Banks stood up to present it he told the room that Howard had been injured in his eyes and in other parts of his body. One sentence in an award speech is the entire record of that accident. Then comes the man who did more with the silver salt than anyone before or since. Justus von Liebig was born in 1803, and out of a career that produced agricultural chemistry, the chemistry of nutrition and the laboratory teaching system every chemistry department still copies, the very first paper he put his name to was about how to prepare silver fulminate without being killed by it. In 1823, in Paris, Liebig and Joseph Louis Gay-Lussac ran the first full quantitative analysis of the fulminates and established the proportions — one silver, one carbon, one nitrogen, one oxygen. He did it with 100 grams of the material, which is where this video has to stop and argue with its own title. In 1824 Friedrich Wöhler published an analysis of silver cyanate, a dull salt you can leave sitting in the sun, and it came out to the same four atoms in the same proportions. Liebig's first move was to accuse Wöhler in print of sloppy work. His second was to repeat the experiment himself, find that Wöhler was right, and say so. In 1826 the two men met in Frankfurt and worked the problem together: same atoms, different order — fulminate is carbon, nitrogen, oxygen, cyanate is nitrogen, carbon, oxygen — and the arrangement is the whole difference between a salt you can ignore and a salt a falling feather will set off. Berzelius named the phenomenon isomerism in 1830, and that is why chemistry now draws molecules as stick figures instead of spelling them out. Which brings the story to the number the title rests on. On June 11th, 1842, at Apothecaries' Hall in London, a chemist named Hennel was stirring about six pounds of mercury fulminate with an ivory spatula when it went off and killed him where he stood. Six pounds, in one vessel, close enough to reach into. Silver fulminate has never been six pounds. It has never been one pound. There is no recorded batch anywhere near that size, anywhere, in 200 years — and the usual explanation, that it detonates under its own weight, carries no citation on the page where you will find it, and was flatly denied by Gerald Hurst, who spent his career as an industrial explosives chemist. What actually caps the quantity are the numbers: impact sensitivity somewhere between 0.1 and 0.5 joules, friction sensitivity under 1 newton — less force than it takes to press a doorbell — and electrostatic discharge at a thousandth of a joule, comfortably inside what a person builds up walking across a room. So the only jobs it could ever hold were small ones, and the first long-term one was a party favour. Tom Smith's Christmas cracker got its bang in 1860, and Smith did not invent it; he bought the design from a chemist named Tom Brown out of the Brocks fireworks company. Two narrow strips of card, one coated with silver fulminate, one with grit, pulled in opposite directions. The army came 25 years later, in 1885.......
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