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a dark-blue powder, C16H10N2 O2, with a coppery luster, the coloring matter and chief ingredient in indigo (the dye)
indigotin . EKI terminibaas Esterm. Estonian Language Institute, Sõnaveeb 2026. https://sonaveeb.ee/search/unif//esterm/indigotin/1/eng (19.06.2026)