Re: heating to solute
Hamish Stewart & Sophie Colmont (Hamish.Sophie@wanadoo.fr)
Thu, 16 Apr 1998 21:27:23 +0200
>Subject: heating to solute
>Sent: 16/4/98 20:32
>Received: 16/4/98 20:35
>From: Phaedrus, stimpy@hobbes.kirtland.cc.mi.us
>To: Alt-Photo, alt-photo-process-l@skyway.usask.ca
>
>I have always had to use heat to get potassium and ammonium dichromates to
>go into solution. Is this wrong? And when the solutions cool, usually a
>large amount re-crystalizes.
>
>Peter
>
This is pretty normal, I usually use hot water to bring the ammonium
dichromate into solution - that's using a 30% solution. And yes often it
crystalizes when it cools. So I just stick the bottle of solution into
hot water until the precipitate goes back into solution. I've been making
gum prints for about 10 years and this has never caused a problem
Hamish
---------------------------------------------------------------------------
-
"We have no theology, we have no dogma, we just dance"
Hamish Stewart
Gum Bichromate Photographer
Astrologer
Tarot
http://www.vrx.net.au/ad163/artists/hamishstewart.html
***************************************************************************
*