Diana
I use gelatin / dichromate to size papers. Works quite well for me in a tri colour gum. I am not sure what is the procedure that James has, so I can not comment on it. You have to remember that dichromates are not the crosslinking agent. They have to be converted Cr (VI) from the dichromate to Cr (III), by either dark reaction, which is slow, or UV light. I coat with gelatin / dichromate , let dry and expose to sunlight for 15-30 minutes to harden the gelatin. I can email details if you want to try.
Marek
> Date: Mon, 7 Apr 2008 00:27:47 -0400
> From: dhbloomfield@bellsouth.net
> Subject: Re: A few gum things
> To: alt-photo-process-l@usask.ca
>
> Oh, I would like to also add that I tried that sizing suggestion in
> James' book (and I saw it mentioned somewhere else, too) where you
> size with gum and dichromate-- I tried that twice and couldn't get it
> to work. Has anybody ever actually tried that, and does it work?
>
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