Gum bichromate printing, one of the oldest photographic processes still in use, offers a way of creating color prints from black and white negatives. Gum bichromate emulsion–potassium dichromate ...

This is activated by immersion in a solution of potassium bichromate, which in practice is frequently rendered alkaline by the addition of ammonia.

Early last year the West German firm of Peter Meyns bought sodium bichromate and potassium bichromate (used in tanning leather) and paraffin wax from the U.S., had the chemicals shipped to West ...

Alder Wright and Mr. C. Thomson (Royal Society, February 2, 1888) have been examining this form of battery, and have found many other acids which act in the same way, such as potassium ...