benzotriazole
noun
ben·zo·tri·azole
¦ben-(ˌ)zō-ˈtrī-ə-ˌzōl
plural -s
: a white crystalline compound C6H5N3 made by the action of nitrous acid on ortho-phenylenediamine and used in photographic developing solutions as an antifoggant
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Merriam-Webster unabridged
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