[alt-photo] Re: Instability of dichromate, et al...was Re:"Moistened"

[Marek Matusz]

Ammonium dichromate is an old "volcano demo" reagent. You can start the self-decomposition reaction by sticking a red hot nail to it, or perhaps a flame from the lighter and then if spews a green ash of chromium oxide in the air as ammonium dichromate is self-decomposing. DOne that a lot of times in the past, before all the regulations. Never had any issues with it. Heating it to very high temperatures in a closed container is however not advisable.

I am sure a lot of more seasoned chemists on the list have seen the volcano demonstartion or done it.

Marek
 
> From: zphoto at montana.net
> Date: Sat, 9 Jan 2010 08:25:32 -0700
> To: alt-photo-process-list at lists.altphotolist.org
> Subject: [alt-photo] Re: Instability of dichromate, et al...was Re:"Moistened"
> 
> I myself have packed my am di in a box in a car trunk and made my husband travel with it through the deep South in 100 degree weather in a car in front of me (feeling guilty all the way) and he lived to tell the tale :) But YRMV (your results may vary).
> Chris
> 
> Christina Z. Anderson
> christinaZanderson.com
> 
> On Jan 8, 2010, at 9:40 PM, Judy Seigel wrote:
> > I myself have lived, slept, shouted, and PERSONALLY EXPLODED, not to mention jumped up & down, cursed & rent my garments on numerous occasions in a room with lots of ammonium dichromate, especially the dry powder (here being called "crystaline"??), but other forms as well, and never got so much as a hiccup out of it.
> > Judy
> 
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