CAS Number7220-79-3HS Code320413IUPAC Name3,7-Bis(dimethylamino)phenothiazin-5-ium chloride hydrate (1:1:3)InChI1S/C16H18N3S.ClH.3H2O/c1-18(2)11-5-7-13-15(9-11)20-16-10-12(19(3)4)6-8-14(16)17-13;;;;/h5-10H,1-4H3;1H;3*1H2/q+1;;;;/p-1InChIKeyXQAXGZLFSSPBMK-UHFFFAOYSA-MLab GradeDCMelting Point190°CMolar Mass373.89 g/molMolecular FormulaC16H18ClN3S3H2OSynonymsMethylene Blue Basic Blue 9;Methyl Blue Basic Blue 9;Methylene Blue 2B;Basic Methylene Blue BB Application Instructions:Basic blue 9 is used for silk, wool dyeing, the light fastness is poor;When used as tannin mordant dyeing for cotton dyeing, light fastness is 3;Basic blue 9 or methyl blue, was previously used for the direct printing of cotton, but now, it is rarely used in this way;Other uses including pigment for the paper, bamboo, wood color, for the manufacture of ink and color lake pigments and biological, bacteriological stain;Also used as solvent dyes.