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This is 100g 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.
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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