I have used white only in printing gum bichromate on black paper (using
a positive transparency). It has not given any more luminosity to the
process. This brings up a different question. I think I would be more
successful using a middle-tone paper and printing up both highlights and
shadows. The problem is: what colored paper can hold up to
multiple-coat gum printing?
Any suggestions are welcome.
Robert Revere
rajai@erols.com