Re: relief

<Dichromate, >relief
<Pigment, >Relief
>Thickness, >relief

This is about the working theory that I have been using. I use 20 ml of a
2.7% spirit solution of Ammonium dichromate for a 9"x11" tissue...I have
reduced the pigment down to a minimum (any less pigment and I can't seem to
get a solid black at the thickness of the tissue)... and I coat thick
enough so that I have not yet accidently exposed/hardened all the way to
the tissue support. And my negs are very contrasty to match the other
parameters.

Interesting enough, I do seem to get a little UV going all the way through.
When I was using a white backing board in the contact printing frame, some
UV was going thru gelatin and the transparent tissue support, and being
bounced off the backing board and back into the gelatin. I was getting a
slightly hardened layer right next to the tissue support. The way I
discovered this is that I use old litho film (tossed out by students) as
the tissue support. One piece had a stripe pattern exposed on it, and this
stripe pattern was repeated in gelatin on the tissue support after
seperating it from the final support. Where the litho film support was
clear, I got some hardening of the gelatin, where the litho was black, I
got less hardening.

Vaughn

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Received on Tue Dec 14 11:43:24 2004