Re: 1st temperaprint

Gord

Each time you coat the Yupo the water is evaporating away leaving just egg
and pigment on the paper. When you coat again with out exposing and washing
off you are effectively adding that egg and pigment to the emulsion that's
in the roller with out including the water content of the formula That will
effect the exposure time and contrast. Coat and expose then re coat and it
will work fine. Incidentally I use a large paint pad rather than a roller as
the action is much more gentle and controllable

Alex

----------
>From: "Gordon J. Holtslander" <holtsg@duke.usask.ca>
>To: alt-photo-process-l@usask.ca
>Subject: 1st temperaprint
>Date: Thu, Feb 9, 2006, 3:37 AM
>

> Hi:
>
> Tried a temperaprint last night. blended an egg, added ammonium
> dichromate (ratio 2 parts egg to 1 part AdC) added some water color
> pigment.
>
> coated yupo - did 3 or 4 coats - letting it dry between coats, and then
> exposed it.
>
> Processed it by putting the print in water until the dichromate dissolved
> and then put it in a tray with a sheet of glass on the bottom, added a
> drop of dishwashing detergent and proceded to carefully roll a roller
> across the print under water. Everything peeled up and floated away.
> :(
>
> I asssume the print was underexposed. In gum printing I can usually see
> the image in the exposed unprocessed paper. I didn't see any image after
> exposing the temperaprint.
>
> Any other reasons for the image to peep away. Too many coatings?
> Completely incorrect processing technique?
>
> Gord
> ---------------------------------------------------------
> Gordon J. Holtslander Dept. of Biology
> holtsg@duke.usask.ca 112 Science Place
> http://duke.usask.ca/~holtsg University of Saskatchewan
> Tel (306) 966-4433 Saskatoon, Saskatchewan
> Fax (306) 966-4461 Canada S7N 5E2
> ---------------------------------------------------------
Received on Thu Feb 9 02:16:44 2006