Methyl blue

Not to be confused with methyl violet or methylene blue.

Methyl blue

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100px Solid methyl blue 100px Methyl blue aqueous solution
Names
Other names Cotton blue, Helvetia blue, Acid blue 93, C.I. 42780
Identifiers
CAS Number	28983-56-4 Y
ChemSpider	8051359 Y
Jmol 3D model	Interactive image
PubChem	9875677
InChI InChI=1S/C37H29N3O9S3.2Na/c41-50(42,43)34-19-13-31(14-20-34)38-28-7-1-25(2-8-28)37(26-3-9-29(10-4-26)39-32-15-21-35(22-16-32)51(44,45)46)27-5-11-30(12-6-27)40-33-17-23-36(24-18-33)52(47,48)49;;/h1-24,38-39H,(H,41,42,43)(H,44,45,46)(H,47,48,49);;/q;2*+1/p-2 Y Key: MCPLVIGCWWTHFH-UHFFFAOYSA-L Y InChI=1/C37H29N3O9S3.2Na/c41-50(42,43)34-19-13-31(14-20-34)38-28-7-1-25(2-8-28)37(26-3-9-29(10-4-26)39-32-15-21-35(22-16-32)51(44,45)46)27-5-11-30(12-6-27)40-33-17-23-36(24-18-33)52(47,48)49;;/h1-24,38-39H,(H,41,42,43)(H,44,45,46)(H,47,48,49);;/q;2*+1/p-2 Key: MCPLVIGCWWTHFH-NUQVWONBAI
SMILES [Na+].[Na+].[O-]S(=O)(=O)c1ccc(cc1)Nc2ccc(cc2)/C(=C\4/C=C\C(=[NH+]/c3ccc(cc3)S([O-])(=O)=O)/C=C/4)c6ccc(Nc5ccc(cc5)S([O-])(=O)=O)cc6
Properties
Chemical formula	C37H27N3Na2O9S3
Molar mass	799.814 g/mol
Appearance	red solid
Solubility in water	Soluble in water, slightly soluble in ethanol
Vapor pressure	{{{value}}}
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Y verify (what is YN ?)
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.

See also

• Potassium ferrocyanide
• Potassium ferricyanide
• Methylene blue
• Egyptian Blue
• Han Purple
• Gentian violet
• Fluorescein