Basic Blue 9 Chemical Structure

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What is Basic Blue 9

Basic Blue 9, sometimes referred to as methylene blue, is a type of dye that sees widespread application in the dying of fabrics. Basic Blue 9 is a hue that can be found in colored paper.

Macsen Laboratories is the leading manufacturer & supplier of Basic Blue 9 with ISO certification.
Name of Product Basic Blue 9
IUPAC Name [7-(dimethylamino)phenothiazin-3-ylidene]-dimethylazanium;chloride
Synonyms Methylene Blue Zinc Free; Methylthioninium Chloride ; Basic Blue 9 ; C.I 52015 ; Methylene Blue Trihydrate; Methylene Blue 2B; Basic Lake Blue BB; Basic Blue BOC; Basic Blue 4RF; Basic Blue BO; Methylene Violet
CAS No 122965-43-9
Molecular Formula C16H18ClN3S
Molecular Weight 319.9 g/mol

Chemical Properties

SR. No Criteria Limit/Specification Our Results
1 Appearance Dark greenish, crystalline powder with a metallic lustre or a dull, dark green or brown powder, almost odourless, hygroscopic. Dark greenish, crystalline powder with a metallic lustre .
2 IDENTIFICATION Must Pass A to D tests Passes Test
3 SOLUBILITY Soluble in 40 parts of water, 110 parts of alcohol (95%) & in 450 parts of chloroform. Complies
4 Loss On Drying (Dried to constant weigh at 105°C) LIMIT: NLT 8.0% - NMT 15.0% of its weight. 12.52 %
6 ZINC Must Pass Test Passes test
7 IRON Must Pass Test Passes Test.
8 LEAD LIMIT: NMT 20 PPM Passes Test
9 ASSAY (WITH REFERENCE TO SUBS. DRIED AT 105 ̊C & AS % OF (C16H18N3ClS) NLT 96.0% & NMT the equivalent of 101.0% 98.87 %


  • Basic Blue 9 is utilised in the production of coloured paper.
  • It is also commonly used for coloring fabrics such as silk, wool, and linen.
  • Other use include as a pigment for bamboo and wood colour, in the production of ink and colour lake pigments, and as a biological and bacteriological stain.

Biological Stains | Classification, Examples & Uses

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