Acid red 33

Name: Acid red 33
Brand: Vaqora Chemicals
SKU: VQ-000448

About Acid red 33

Listed under CAS 3567-66-6, Acid red 33 is a biological stain available from Vaqora Chemicals. Formula C16H11N3Na2O7S2, molecular weight 467.4 g/mol. The IUPAC name is disodium, 5-amino-4-hydroxy-3-phenyldiazenylnaphthalene-2,7-disulfonate. It is also known as Acid Red 33 disodium salt or Food Red 12.

The product is provided as a solid. Keep the container tightly sealed and store it in a cool, dry area. The GHS classification uses the signal word “Warning”, so appropriate gloves, eye protection and ventilation are recommended.

It is commonly used for histology and cytology staining, microscopy, clinical laboratories and dyes and pigments manufacture. Typical end-use sectors are academic and industrial research, diagnostics and biotechnology and textiles and dyeing.

Available in 25 g and 100 g packs, Acid red 33 is dispatched with a Certificate of Analysis (COA) to destinations worldwide.

Typical applications

Histology & cytology staining
Microscopy
Clinical laboratories
Dyes & pigments manufacture

Industries

Specifications & identifiers

Chemical identifiers
Product name	Acid red 33
Catalogue No.	VQ-000448
CAS Number	3567-66-6
IUPAC name	disodium;5-amino-4-hydroxy-3-phenyldiazenylnaphthalene-2,7-disulfonate
Molecular formula	C₁₆H₁₁N₃Na₂O₇S₂
Molecular weight	467.4 g/mol
Exact mass	466.9834
HSN code	32041213
InChIKey	LQJVOKWHGUAUHK-UHFFFAOYSA-L
SMILES	C1=CC=C(C=C1)N=NC2=C(C3=C(C=C(C=C3C=C2S(=O)(=O)[O-])S(=O)(=O)[O-])N)O.[Na+].[Na+]
PubChem CID	19116

Physical properties
Physical form	Solid
Appearance	Solid
H-bond donors / acceptors	2 / 10
TPSA	202 Å²
Synonyms	5-Amino-4-hydroxy-3-phenylazo-2,7-naphthalenedisulfonic acid disodium salt, Acid Red 33 disodium salt, Disodium 5-amino-4-hydroxy-3-(phenylazo)-naphthalene-2,7-disulfonate, Food Red 12, Azo fuchsine, D&C Red 33, Azo grenadine, C.I. Acid Red 33, disodium salt, Acid fuchsine D, Redusol Z, Azo magenta G, Certicol Red B

Safety & hazard information (GHS)

Harmful / irritant

Signal word: Warning

Hazard statements

H319Causes serious eye irritation
H412Harmful to aquatic life with long lasting effects

Precautionary statements: P264 + P265, P273, P280, P305 + P351 + P338, P337 + P317, P501

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

Frequently asked questions

What is the CAS number of Acid red 33?

The CAS Registry Number of Acid red 33 is 3567-66-6. It is also known as 5-Amino-4-hydroxy-3-phenylazo-2,7-naphthalenedisulfonic acid disodium salt, Acid Red 33 disodium salt, Disodium 5-amino-4-hydroxy-3-(phenylazo)-naphthalene-2,7-disulfonate.

What is the molecular formula and molecular weight of Acid red 33?

Acid red 33 has the molecular formula C16H11N3Na2O7S2 and a molecular weight of 467.4 g/mol.

Which grade and pack sizes of Acid red 33 can I order?

We supply Acid red 33, in 25 g, 100 g packs. Larger bulk quantities and custom packing are quoted on request.

Do you provide a COA and SDS with Acid red 33?

Yes. Every lot of Acid red 33 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 Acid red 33 be shipped internationally?

Yes. Acid red 33 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.