METH BL has various meanings in the Health category. Discover the full forms, definitions, and usage contexts of METH BL in Health.
Methylene blue, a bright greenish blue organic dye belonging to the phenothiazine family. It is mainly used on bast (soft vegetable fibres such as jute, flax, and hemp) and to a lesser extent on paper, leather, and mordanted cotton. It dyes silk and wool but has very poor light fastness on these fibres. It is also employed as a biological stain, in testing milk for tubercular infection, and as a chemical oxidation–reduction indicator.
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