as combined developers in a single concentrated stock solution with long shelf life. This developer has both staining and tanning properties and negatives developed with it are immune to the callier effect. It can be used for small and large negative formats.

The Darkroom Cookbook (Alternative Process Photography) has examples.

Safety

Pyrogallol use, e.g. in hair dye formulations, is declining because of concerns about its toxicity.Its (oral, rat) is 300 mg/kg.

Pure

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