Re: gum bichromate

Carson Graves x4692 3NE (carson@zama.hq.ileaf.com)
Fri, 9 Jun 95 16:25:15 EDT

> From vast.unsw.edu.au!alt-photo-process@ileaf.prospect.com Fri Jun 9 16:10:41 1995
> Reply-To: alt-photo-process@vast.unsw.edu.au
> Originator: alt-photo-process@vast.unsw.edu.au
> Sender: alt-photo-process@vast.unsw.edu.au
> From: anthony corkhill <corvet@corvet.win-uk.net>
> To: Multiple recipients of list <alt-photo-process@vast.unsw.edu.au>
> Subject: gum bichromate
> X-Listprocessor-Version: 6.0c -- ListProcessor by Anastasios Kotsikonas
> X-Comment: Alternative Photographic Processes mailing list
>
> I used this process about 12 months ago using saturated potassium bichromate &
> gum based glue. It worked though not very consistantly. Unfotunately I did not
> follow this up until now when it doesn't work at all! Is this because my
> bichromate solution is old? If any one who has experience of using this
> process could give help or advice on the best and most consistant methods of
> gum bichromate printing it would be most appreciated
> thanks, Anthony

It's hard to offer specific advice without more information, but one
thing to watch out for is humidity. If there is too much, the image
won't "develop" (wash out). Generally, the lower the better, but
best is a constant relative humidity level somewhere below 50%.

I haven't heard of a dichromate solution getting too old to use.

Hope this helps
Carson Graves
carson@ileaf.com