Azur I

Name: Azur I
Brand: Vaqora Chemicals
SKU: VQ-000486

About Azur I

Listed under CAS 531-53-3, Azur I is a biological stain available from Vaqora Chemicals in Microscopy grade. With the molecular formula C14H14ClN3S, it has a molar mass of 291.8 g/mol. Systematically, it is named (7-aminophenothiazin-3-ylidene)-dimethylazanium chloride. Alternative names: Giemsa stain and Giemsa's stain.

It is supplied as a solid. Literature values give a melting point of 290 °C (dec.). Store in a tightly closed container in a cool, dry and well-ventilated place. The GHS classification uses the signal word “Warning”, so appropriate gloves, eye protection and ventilation are recommended.

Key uses span histology and cytology staining, microscopy, clinical laboratories and biological staining. It is used across academic and industrial research, diagnostics and biotechnology and textiles and dyeing.

Standard pack sizes are 5 g, 25 g, 1 kg and 25 kg, and every batch ships with a Certificate of Analysis (COA) and we export worldwide.

Typical applications

Histology & cytology staining
Microscopy
Clinical laboratories
Biological staining

Industries

Specifications & identifiers

Chemical identifiers
Product name	Azur I
Catalogue No.	VQ-000486
CAS Number	531-53-3
IUPAC name	(7-aminophenothiazin-3-ylidene)-dimethylazanium chloride
Molecular formula	C₁₄H₁₄ClN₃S
Molecular weight	291.8 g/mol
Exact mass	291.0597
Grade	Microscopy
HSN code	32049000
InChIKey	NALREUIWICQLPS-UHFFFAOYSA-N
SMILES	C[N+](=C1C=CC2=NC3=C(C=C(C=C3)N)SC2=C1)C.[Cl-]
PubChem CID	13735

Physical properties
Physical form	Solid
Melting point	290 °C (dec.)
H-bond donors / acceptors	1 / 4
TPSA	66.7 Å²
Synonyms	Giemsa stain, Giemsa's stain, Stain, Giemsa, Dimethylthionine, Azure A chloride, 3-Amino-7-(dimethylamino)phenothiazin-5-ium chloride, Azur A, N,N-Dimethylthionine, Phenothiazin-5-ium, 3-amino-7-(dimethylamino)-, chloride, 3-Amino-7-dimethylaminophenothiazin-5-ium chloride, asym-Dimethyl-3,7-diaminophenazathionium chloride, 3-Amino-7-dimethylaminophenazathionium chloride

Safety & hazard information (GHS)

Harmful / irritant

Signal word: Warning

Hazard statements

H319Causes serious eye irritation

Precautionary statements: P264 + P265, P280, P305 + P351 + P338, P337 + P317

Classification is indicative (aggregated GHS notifications) and may vary by grade and concentration. Always refer to the SDS supplied with your lot.

Documents

Safety Data Sheet (SDS)16-section GHS · on request Certificate of AnalysisTypical / batch COA · on request Specification sheetTDS / MOA · on request

Other grades of CAS 531-53-3

Microscopy

Azur A

CAS: 531-53-3
Formula: C₁₄H₁₄ClN₃S
MW: 291.8 g/mol

VQ-000483

Frequently asked questions

What is the CAS number of Azur I?

The CAS Registry Number of Azur I is 531-53-3. It is also known as Giemsa stain, Giemsa's stain, Stain, Giemsa.

What is the molecular formula and molecular weight of Azur I?

Azur I has the molecular formula C14H14ClN3S and a molecular weight of 291.8 g/mol. Its IUPAC name is (7-aminophenothiazin-3-ylidene)-dimethylazanium chloride.

Which grade and pack sizes of Azur I can I order?

We supply Azur I in Microscopy grade, in 5 g, 25 g, 1 kg, 25 kg packs. Larger bulk quantities and custom packing are quoted on request.

Do you provide a COA and SDS with Azur I?

Yes. Every lot of Azur I is shipped with a batch-specific Certificate of Analysis, and a 16-section GHS Safety Data Sheet is provided with the quotation and the shipment.

Can Azur I be shipped internationally?

Yes. Azur I is classified as hazardous, so it is packed in UN-approved packaging and shipped as dangerous goods under IATA/IMDG rules. We export worldwide on EXW, FOB, CIF and DAP terms.