Re: relief

Vaughn Hutchins wrote:
> <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.
>
will try it

> 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
>
thats a good idea, a variety of an "actinometer" on the backside of the
print, I`ll put a PET film with a bit of normal carbon emulsion on the
backside of the tests to see how much UV that actually gets through or not.
thanks
Halvor
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Received on Wed Dec 15 06:22:46 2004