This process is one of the most versatile and least complicated of all the non-silver processes. Two kits are available; one with only black pigment and one containing red, blue and yellow pigments. Both kits come with all the chemistry needed and very extensive instructions for their use Gum Bichromate prints are characterized by a long, open scale that is soft and romantic, but fine detail is not possible. These kits will produce about 25 8 x 10 prints.