OK, I tried a tricolor gum today with the intent of
getting true color. Using 1:1 gum/dichromate ratios and sun exposures of 3
minutes and 30-60 minute development, I ended up with this:
My guess is that I'm not putting enough pigment in
my mixes...especially the blue pigment.
I used Prussian Blue, Warm Sepia, and Anthraquinoid
Red...all Daniel Smith watercolors.