>>> Benzotriazole

 I have used benzotriazole  in darkroom work. I mixed it up as a 10% solution and used it to modify print developers. It's used as a restrianer to
hold back the development of a print and also to modify the tones, but it's also the cure for salvaging out dated paper (fogged).  It's sold
commercially by several companies (like Calumet/Zone VI) as a liquid concentrate and is sometimes  called Liquid Orthazite....this probably
doesn't answer your question, but hope it helps.

Kent Thompson,  Photographer
North Carolina Museum of History
4650 Mail Service Center
Raleigh, NC  27699-4650

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