Methyl blue

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Not to be confused with methyl violet or methylene blue.
Methyl blue
Methyl blue.png
Sample of Methyl Blue.jpg
Solid methyl blue
Methyl Blue aqueous solution.jpg
Methyl blue aqueous solution
Names
Other names
Cotton blue, Helvetia blue, Acid blue 93, C.I. 42780
Identifiers
28983-56-4
ChemSpider 8051359 YesY
Jmol-3D images Image
PubChem 9875677
Properties
C37H27N3Na2O9S3
Molar mass 799.814 g/mol
Appearance red solid
Soluble in water, slightly soluble in ethanol
Hazards
NFPA 704
Flammability code 1: Must be pre-heated before ignition can occur. Flash point over 93 °C (200 °F). E.g., canola oil Health code 1: Exposure would cause irritation but only minor residual injury. E.g., turpentine Reactivity code 0: Normally stable, even under fire exposure conditions, and is not reactive with water. E.g., liquid nitrogen Special hazards (white): no codeNFPA 704 four-colored diamond
Except where noted otherwise, data is given for materials in their standard state (at 25 °C (77 °F), 100 kPa)
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Infobox references

Methyl blue is a chemical compound with the molecular formula C37H27N3Na2O9S3. It is used as a stain in histology, and stains collagen blue in tissue sections. It can be used in some differential staining techniques such as Mallory's connective tissue stain and Gömöri trichrome stain, and can be used to mediate electron transfer in microbial fuel cells. Fungal cell walls are also stained by methyl blue.

Methyl blue is also available in mixture with water blue, under name Aniline Blue WS, Aniline blue, China blue, or Soluble blue.

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