>>> 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 Email: [log in to unmask] Opinions expressed in this message may not represent the policy of my agency. E-Mail to and from me, in connection with the transaction of public business, is subject to the North Carolina Public Records Law and may be disclosed to third parties. ========================================================= Important Subscriber Information: The Museum-L FAQ file is located at http://www.finalchapter.com/museum-l-faq/ . You may obtain detailed information about the listserv commands by sending a one line e-mail message to [log in to unmask] . The body of the message should read "help" (without the quotes). If you decide to leave Museum-L, please send a one line e-mail message to [log in to unmask] . The body of the message should read "Signoff Museum-L" (without the quotes).