Re: Was: CuCl etching

From: martin griffith (martingriffithX_at_Xyahoo.co.uk)
Date: 02/13/05 

Date: Sun, 13 Feb 2005 20:06:57 +0100

On Sun, 13 Feb 2005 13:48:46 -0500, in sci.electronics.design Mark
Jones <abuse@127.0.0.1> wrote:

> A much safer alternative is ammonium tri-iodide. Take a pitri dish, add a few
>(read: one or two) iodine crystals, add just enough ammonia to cover. Ammonia in
>this case is household ammonia - the pure stuff would make the result far too
>unstable - breathing on it would set it off. Swirl gently, and after a few
>minutes the iodine crystals will turn purple. When wet, it is harmless. But once
>they dry, they become explosive. Apparently the molecules line up in very long
>chains when drying and are easily broken by physical force, creating a miniature
>atomic chain-reaction. The product of explosion is simple dis-assembly of the
>structure - it leaves an ammonia-and-iodine-stain on whatever unlucky thing
>touched it.

Ah.... those were the days, when schools really taught chemistry.

martin

"Facts are stupid things.." -- Reagan, '88

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