Methylene blue
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Methylene blue:-
Methylene blue is a bright greenish blue organic dye belonging to the phenothiazine family. It is mainly used on bast and to a lesser extent on paper, leather, and mordanted cotton. It dyes silk and wool but has very poor lightfastness on these fibres. It is also employed as a biological stain, in testing milk for tubercular infection, and as a chemical oxidation–reduction indicator.
