The chemical Pyrogallol is an active agent in Pyro film developers.
At one time, Pyro was a universally used developer. It was even available in prepackaged formulas from companies such as Eastman Kodak. Unfortunately, it has been almost entirely replaced by metol-hydroquinone and Phenidone-hydroquinone type developers.
The main reasons for that are the fact that Pyro stains, it must be handled carefully, and it does not keep well in solution.
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