Photographers' Formulary Classical Gum Bichromate Kit

This kit contains only black pigment for making black-and-white prints. Has liquid Gum Arabic, Ammonium Dichromate and extensive directions for their use. Gum printing is unique among all the printing processes. It is distinguished by unlimited flexibility. The printer has complete control and may produce prints of any color or contrast. These prints are characterized by a long, open scale that is soft and romantic, but fine detail is not possible.

Gum printing uses water color pigments rather than metal to form the base. The paper is coated with the gum arabic and a dichromatic salt. When dried paper is contact printed, the exposed areas become water soluable. A warm water development dissolves the gum from the unexposed areas. The pigment in the retained areas forms the image. Multiple printing wiht different colors is a common technique.

Will make 50 8 x 10" (20 x 25cm) prints.