Methyl blue

Name: Methyl blue
Brand: Vaqora Chemicals
SKU: VQ-000620

About Methyl blue

Methyl blue is a biological stain (Microscopy grade) carrying the CAS registry number 28983-56-4. Formula C37H28N3Na2O9S3+, molecular weight 800.8 g/mol. Alternative names: Helvetia Blue and Acid Blue 93.

In its supplied form it is dark red brown powder or crystals. Keep the container tightly sealed and store it in a cool, dry area. Handle it with standard laboratory precautions and appropriate personal protective equipment.

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 25 g, 100 g, 1 kg and 25 kg, and every batch ships with a Certificate of Analysis (COA) and we export worldwide. SDS and detailed specification sheets can be requested with your quotation.

Typical applications

Histology & cytology staining
Microscopy
Clinical laboratories
Biological staining

Industries

Specifications & identifiers

Chemical identifiers
Product name	Methyl blue
Catalogue No.	VQ-000620
CAS Number	28983-56-4
IUPAC name	disodium;4-[4-[[4-(4-sulfoanilino)phenyl]-[4-(4-sulfonatophenyl)azaniumylidenecyclohexa-2,5-dien-1-ylidene]methyl]anilino]benzenesulfonate
Molecular formula	C₃₇H₂₈N₃Na₂O₉S₃⁺
Molecular weight	800.8 g/mol
Exact mass	800.0783
Grade	Microscopy
HSN code	32041251
InChIKey	MCPLVIGCWWTHFH-UHFFFAOYSA-M
SMILES	C1=CC(=[NH+]C2=CC=C(C=C2)S(=O)(=O)[O-])C=CC1=C(C3=CC=C(C=C3)NC4=CC=C(C=C4)S(=O)(=O)O)C5=CC=C(C=C5)NC6=CC=C(C=C6)S(=O)(=O)[O-].[Na+].[Na+]
PubChem CID	76956083

Physical properties
Physical form	Crystalline
Appearance	Dark red brown powder or crystals
H-bond donors / acceptors	4 / 11
TPSA	232 Å²
Synonyms	Helvetia Blue, Acid Blue 93, C.I. Acid Blue 93, C.I. Acid Blue 93, disodium salt, Ink Blue, Soluble Blue, Helvetia Blue I, Ink Blue Special, Water Blue B, Soluble Blue 8B, Water Blue IN, Silk Blue H

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 28983-56-4

Aniline blue, water soluble

CAS: 28983-56-4
Formula: C₃₇H₂₈N₃Na₂O₉S₃⁺
MW: 800.8 g/mol

VQ-000471

AR

Aniline blue, water soluble, AR

CAS: 28983-56-4
Formula: C₃₇H₂₈N₃Na₂O₉S₃⁺
MW: 800.8 g/mol

VQ-046703

Microscopy

Cotton blue

CAS: 28983-56-4
Formula: C₃₇H₂₈N₃Na₂O₉S₃⁺
MW: 800.8 g/mol

VQ-000542

Methyl blue, aqueous solution

CAS: 28983-56-4
Formula: C₃₇H₂₈N₃Na₂O₉S₃⁺
MW: 800.8 g/mol

VQ-003592

Frequently asked questions

What is the CAS number of Methyl blue?

The CAS Registry Number of Methyl blue is 28983-56-4. It is also known as Helvetia Blue, Acid Blue 93, C.I. Acid Blue 93.

What is the molecular formula and molecular weight of Methyl blue?

Methyl blue has the molecular formula C37H28N3Na2O9S3+ and a molecular weight of 800.8 g/mol.

Which grade and pack sizes of Methyl blue can I order?

We supply Methyl blue in Microscopy grade, in 25 g, 100 g, 1 kg, 25 kg packs. Larger bulk quantities and custom packing are quoted on request.

Do you provide a COA and SDS with Methyl blue?

Yes. Every lot of Methyl blue 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 Methyl blue be shipped internationally?

Yes. We export Methyl blue worldwide by air and sea freight or express courier, on EXW, FOB, CIF, CFR or DAP Incoterms, with full export documentation.