Re: image transfer-was thought this was interesting

[Achal Pashine <achalpashine@xxxxxxxxx>]

we use desiccator/dark to store ammonium dichromate. But, it is
possible that it may change color over the years. Yellow is close
enough, try heating it to its boiling point (~200oc), if it glows and
suddenly tries to kinnda explode/lights up then you have the correct
chemical; if you have a wrong chemical, you may just die of fumes, so
no worries. ;-)
by "thiorea" you mean Thio-urea? Thiol grp consists of sulphur, so some might call it sulpho-urea. (or sulphorea?) ;)
Achal

On 5/25/05, lookaround360@xxxxxxxxxxxxxxxxx < lookaround360@xxxxxxxxxxxxxxxxx> wrote:

Thanks for your help Aschal.

It isn't orange so it must be lemon!  I think it was left over from some
thiorea toner experiments (Eddie Ephram's books).    BTW What's the
other name for thiorea?

AZ

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> -------- Original Message --------
> Subject: Re: image transfer-was thought this was interesting
> From: Achal Pashine <achalpashine@xxxxxxxxx>
> Date: Tue, May 24, 2005 12:50 pm
> To: List for Photo/Imaging Educators - Professionals - Students
> < photoforum@xxxxxxxxxxxxxxxxxxxxxx>
>
> >
> > BTW does anyone know how to identify amonium dichromate?
>
>
> Alan,
> If you are sure that you have it in your lab and if only one among many
> bottles has bright orange crystalline substance in it, then it is ammonium
> dichromate. It is highly oxidizing. wear safety glasses.
> thanks,
> Achal

-- 
Achal Pashine