# Azure A

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Azure A Names IUPAC name N',N'-dimethylphenothiazin-5-ium-3,7-diamine chloride Other names asym-Dimethylthionine Chloride; Methylene Azure A Identifiers CAS Number 531-53-3 Y 3D model (JSmol) Interactive image Beilstein Reference 3922287 ChEBI CHEBI:87637 N ChemSpider 11218930 Y ECHA InfoCard 100.007.738 PubChem CID 13735 UNII M731V243EF Y CompTox Dashboard (EPA) DTXSID2040157 InChI InChI=1S/C14H14N3S.ClH/c1-17(2)10-4-6-12-14(8-10)18-13-7-9(15)3-5-11(13)16-12;/h3-8H,15H2,1-2H3;1H/q+1;/p-1 Y Key: PGWTYMLATMNCCZ-UHFFFAOYSA-M Y SMILES [Cl-].CN(C)c1cc2[s+]c3cc(N)ccc3nc2cc1 Properties Chemical formula C14H14ClN3S Appearance green to dark brown powder Density 1.776 Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). N verify (what is YN ?) Infobox references

Chemical compound

**Azure A** is an organic [compound](/source/Chemical_compound) with the [chemical formula](/source/Chemical_formula) C14H14ClN3S. It is a light blue to dark blue [dye](/source/Dye). It is used as a screening test for [mucopolysaccharides](/source/Mucopolysaccharides). It can also be used to stain [lysosomes](/source/Lysosomes) in blood smears, and is often used in [Giemsa stain](/source/Giemsa_stain). It's formed via oxidation of [Methylene blue](/source/Methylene_blue).[1]

## References

1. **[^](#cite_ref-1)** ["Azure A - Dyes for Histology"](https://www.stainsfile.com/dyes/azure-a/). *StainsFile*. Retrieved 2025-07-28.

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Adapted from the Wikipedia article [Azure A](https://en.wikipedia.org/wiki/Azure_A) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Azure_A?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.