Water_blue
Water blue
Chemical compound
Water blue, also known as aniline blue, Acid blue 22, Soluble Blue 3M, Marine Blue V, or C.I. 42755, is a chemical compound used as a stain in histology. Water blue stains collagen blue in tissue sections. It is soluble in water and slightly soluble in ethanol.
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Water blue is also available in mixture with methyl blue, under the names Aniline Blue WS, Aniline blue, China blue, or Soluble blue.[1][2]
It can be used in the Mallory's trichrome stain of connective tissue and Gömöri trichrome stain of muscle tissue. It is used in differential staining.[3]