Methyl Blue

• CAT Number: R071059
• CAS Number: 28983-56-4
• Molecular Formula: C37H27N3Na2O9S3
• Molecular Weight: 799.80
• Purity: ≥95%
• Synonyms: disodium;2-[4-[[4-(2-sulfoanilino)phenyl]-[4-(2-sulfonatophenyl)iminocyclohexa-2,5-dien-1-ylidene]methyl]anilino]benzenesulfonate
• IUPAC Name: disodium;4-[4-[[4-(4-sulfoanilino)phenyl]-[4-(4-sulfonatophenyl)azaniumylidenecyclohexa-2,5-dien-1-ylidene]methyl]anilino]benzenesulfonate
• 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-1
• InChIKey: MCPLVIGCWWTHFH-UHFFFAOYSA-M
• SMILES: C1=CC(=[NH+]C2=CC=C(C=C2)S(=O)(=O)[O-])C=CC1=C(C3=CC=C(C=C3)NC4=CC=C(C=C4)S(=O)(=O)O)C5=CC=C(C=C5)NC6=CC=C(C=C6)S(=O)(=O)[O-].[Na+].[Na+]

Methyl Blue（Cat No.:R071059）, also known as Cotton Blue or Aniline Blue, is a synthetic dye belonging to the triphenylmethane family. It is widely used in histology and microbiology as a staining agent, particularly for visualizing fungal cell walls, collagen fibers, and certain polysaccharides. Its strong affinity for cellulose and chitin makes it useful in plant and fungal research. Beyond microscopy, Methyl Blue is applied as a pH indicator, textile dye, and in paper industries. Its vivid blue coloration and binding specificity support diverse biological and industrial applications.