From: George Huczek (ghuczek@sk.sympatico.ca)
Date: 07/09/01-04:21:28 PM Z
I am doing gum prints with Linel helios yellow 1:1 gum and pot. di.
sensitizer.
After exposure the pigment changes from a bright yellow to an olive green.
After development, drying and clearing with potassium metabisulfite the
olive green colour persists, so I don't suspect dichromate stain. The
highlights cleared to the paper base colour. Can anyone suggest why the
pigment colour changed after UV exposure?
_
[o] -GH
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