Naphthol yellow S

Name: Naphthol yellow S
Brand: Vaqora Chemicals
SKU: VQ-000647

About Naphthol yellow S

Listed under CAS 846-70-8, Naphthol yellow S is a biological stain available from Vaqora Chemicals (Synthesis grade). Its molecular formula is C10H4N2Na2O8S and its molecular weight is 358.19 g/mol. Systematically, it is named disodium, 5,7-dinitro-8-oxidonaphthalene-2-sulfonate. Alternative names: Acid Yellow 1 and Food Yellow 1.

The material typically appears as a light yellow to yellow and light orange to brown powder. Store in a tightly closed container in a cool, dry and well-ventilated place. It carries the GHS signal word “Warning” with 2 hazard statements. Review the Safety Data Sheet before use.

It is commonly used for histology and cytology staining, microscopy, clinical laboratories and biological staining. Buyers come mainly from academic and industrial research, diagnostics and biotechnology and textiles and dyeing.

Standard pack sizes are 25 g, 100 g and 1 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	Naphthol yellow S
Catalogue No.	VQ-000647
CAS Number	846-70-8
IUPAC name	disodium;5,7-dinitro-8-oxidonaphthalene-2-sulfonate
Molecular formula	C₁₀H₄N₂Na₂O₈S
Molecular weight	358.19 g/mol
Exact mass	357.9484
Grade	Synthesis
HSN code	29089990
InChIKey	CTIQLGJVGNGFEW-UHFFFAOYSA-L
SMILES	C1=CC2=C(C=C1S(=O)(=O)[O-])C(=C(C=C2[N+](=O)[O-])[N+](=O)[O-])[O-].[Na+].[Na+]
PubChem CID	2724063

Physical properties
Physical form	Powder
Appearance	Light yellow to yellow and light orange to brown powder
H-bond donors / acceptors	0 / 8
TPSA	180 Å²
Synonyms	Acid Yellow 1, Food Yellow 1, Sodium flavianate, Flavianic acid, sodium salt, Acid Yellow S, C.I. Acid Yellow 1, Flavianic acid disodium salt, Amacid Yellow S, C.I. Food Yellow 1, Kiton Yellow S, Paper Yellow L, Zlut naftolova S

Safety & hazard information (GHS)

Harmful / irritant

Health hazard

Signal word: Warning

Hazard statements

H317May cause an allergic skin reaction
H373May causes damage to organs through prolonged or repeated exposure

Precautionary statements: P260, P261, P272, P280, P302 + P352, P319, P321, P333 + P317, P362 + P364, 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 Naphthol yellow S?

The CAS Registry Number of Naphthol yellow S is 846-70-8. It is also known as Acid Yellow 1, Food Yellow 1, Sodium flavianate.

What is the molecular formula and molecular weight of Naphthol yellow S?

Naphthol yellow S has the molecular formula C10H4N2Na2O8S and a molecular weight of 358.19 g/mol.

Which grade and pack sizes of Naphthol yellow S can I order?

We supply Naphthol yellow S in Synthesis grade, in 25 g, 100 g, 1 kg packs. Larger bulk quantities and custom packing are quoted on request.

Do you provide a COA and SDS with Naphthol yellow S?

Yes. Every lot of Naphthol yellow S 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 Naphthol yellow S be shipped internationally?

Yes. Naphthol yellow S 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.