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• 16:36, 26 April 2026 MDerrick talk contribs created page Basic Blue 9, CI 52015, Methylene Blue, LC (Created page with "== Usage History == Dark green crystals that form a deep blue aqueous solution. Methylene blue was first prepared in 1876 by Caro. It is a synthetic aniline dye that was used a lightfast colorant for cotton, silk, and wool (often with zinc as a mordant). == Synonyms == C.I. 52015; Methylene Blue; Basic Blue 9; Methylene Blue N; Swiss Blue; Chromosmon; Methylthionine Chloride; Methylthioninium Chloride; Urolene Blue == Molecular Information == * Molecular Formula...")