Difference between Ammonium and Potassium Dichromate

March 31, 2019

darkroom-dave asked: Hey Tony, I was curious about the differences between potassium bichromate and ammonium bichromate and why you use the later.

I find the Potassium Dichromate doesn’t dissolve as well as the Ammonium Dichromate.  Apparently, Potassium Dichromate produces less contrast but I can control the contrast in my print by varying the ration of Gum Arabic to Sensitizer using Ammonium Dichromate.

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