Methylene blue

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Methylene_Blue.gif
Structural formula of methylene blue

Methylene Blue, methylthionine chloride or 3,7-bis(dimethylamino)phenothiazin-5-ium chloride is a chemical compound used as a dye and medication for Gram's stain, Wright's stain, and Jenner's stain and the treatment of methemoglobinemia.

Its molecular formula is C16H18ClN3S.

Its CAS number is 61-73-4: its EC number is 200-515-2 .

Methylene Blue is also used in aquaculture, particularly by tropical fish hobbyists, as a treatment for ich (Ichthyophthirius multifilis).

Methylene Blue should not be confused with another histology stain methyl blue.

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