Supplied as a single liquid concentrate designed to intensify thin B&W negatives. The negative is bleached back in CI10 (diluted 1+4 with water) and then redeveloped in PRINT developer. The image will return stronger. The process can be repeated a few times to maximise intensification. There is no need to refix the negative - just wash thoroughly.
An additional correction chemical that may also be of interest is Farmers Reducer. It contains Potassium Ferricyanide and it bleaches by lightening your negatives or prints that you have overexposed or developed for too long.
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