Potassium citrate

Potassium citrate
A chemical used in blue and green toners.
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Potassium citrate - chemical used in blue and green toners.
Potassium dichromate - See Potassium bichromate.
Potassium ferricyanide - chemical used in Farmer's reducer as a bleach.

-Belitski's reducer - solution used as a chemical reducer for negatives. It consists of ferric potassium citrate or oxalate in an acid fixing solution.

See also: Potassium bichromate, ISO, Stand, Digital, Potassium dichromate