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This is 5 lb of Potassium Ferricyanide from Photographers' Formulary. It is mainly used in bleach baths, such as a bleach prior to sulfide toning, as well as a component in iron printing processes and dye-toning formulas.
Table of Contents
Ferricyanide Ferricyanide of potash Red praised of potash
Bright red, crystalline powder Odorless
Principal use is in conjunction with hypo, forming Farmer's Reducer Used in iron printing processes As a bleach before sulfide toning, and dye toning formulas