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Potassium ferricyanide is a widely used oxidizing agent in photography to remove silver from color negatives and positives during processing, a process known as bleaching. It is also used to create a color-correcting solution that reduces the size of color dots in cyanotype prints. It is also a chemical ingredient in the rehalogenating bleaches and cyanotypes of Kodak’s C-41 process.
It is also used in the etching of ethamsylate and as an external indicator in titrations in which ferrous iron is oxidized to ferric iron using acidified potassium dichromate. Potassium ferricyanide is an inexpensive alternative to ruthenian hexaammine and can be easily dissolved in water or ethanol. The reaction is fast, requires no expensive metal complexes as catalysts, and produces Prussian blue as a byproduct, which is not toxic.
Uptake, accumulation and metabolic response of ferricyanide in weeping willows (Salix babylonica L.) were investigated using pre-rooted plants grown hydroponically and treated with potassium ferricyanide in growth chambers. The results indicated that cyanide was taken up through roots and transported to leaves. Cyanide accumulated in plants tended to be higher than the amount emitted through respiration. The results suggest that transport is the limiting step in uptake of ferricyanide in plants.
A novel amperometric glucose biosensor was developed by immobilizing enzyme glucose oxidase on electrochemically polymerized polyaniline-polyvinylsulfonate-potassium ferricyanide (Pani-Pvs-Fc) films. The sensor is capable of determining glucose via oxidation of potassium ferricyanide at 0.3 V vs. Ag/AgCl. The stability of the sensor was assessed by evaluating its ability to retain activity over long periods of time, at high temperatures, and in aqueous media. The spectroscopic properties of the Pani-Pvs-Fc-based electrode were also studied.