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Azure A Chemical Structure

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What is Azure A

Azure A is an organic chloride salt having 3-amino-7-(dimethylamino)phenothiazin-5-ium as the counterion. It is used in making azure eosin stains for blood smear staining. It also has a role as a histological dye and a fluorochrome.

Macsen Laboratories is the manufacturer and supplier of high-quality Azure A.
IUPAC Name (7-aminophenothiazin-3-ylidene)-dimethylazanium;chloride
SYNONYMS Giemsa stain; Dimethylthionine; N,N-Dimethylthionine; Azur A; 3-Amino-7-(dimethylamino)phenothiazin-5-ium chloride
CAS No 531-53-3
Molecular Formula C14H14ClN3S
Molecular Weight 291.8 g/mol
Pubchem CID 13735
Pubchem SID 462770358

Chemical Properties

SR. No Criteria Limit/Specification
1 Appearance Green to Very Dark Green Powder
2 Solubility(Color) at 4mg Plus 4ml of Water Dark Blue to Very Dark Blue and Dark Purple to Very Dark Purple and Blue- Purple
3 Infrared Spectrum Conforms to Structure
4 Nitrogen 10.0 - 14.4 %
5 Dye Content ≥ 70 %


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