>#3 In Kent Wade's "Alternative Photographic Processes", Morgan & Morgan
>1978, ISBN 0-87100-136-5, p 77 - 78 he mentions two methods one
>non-silver technique using a colloid made of gelatin, water & sugar
>sensitized w/ammonium dichromte (no recipe) and a photoresist us
>Kodak's Photo Resist (which I believe I read on this list is no longer
>made).
I've just stepped into this thread, but FWIW, there is an exquisitely
beautiful colour portrait by
Garo on a ceramic tile at the George Eastman House. I don't know the
technique he used but I'm sure they might. Gum Bichromate was his usual
method, but in this case, I just don't know.
ELF