Naphthol orange

Name: Naphthol orange
Brand: Vaqora Chemicals
SKU: VQ-000646

About Naphthol orange

Naphthol orange (CAS 523-44-4) is a biological stain offered by Vaqora Chemicals (Microscopy grade). Its molecular formula is C16H11N2NaO4S and its molecular weight is 350.3 g/mol. Its systematic (IUPAC) name is sodium 4-[(4-hydroxynaphthalen-1-yl)diazenyl]benzenesulfonate. Common synonyms include Orange I and C.I. Acid Orange 20.

The material typically appears as orange to brown to dark red powder or crystals. Store in a tightly closed container in a cool, dry and well-ventilated place. Good laboratory practice and suitable PPE are recommended during handling.

Typical applications include histology and cytology staining, microscopy, clinical laboratories and biological staining. Typical end-use sectors are academic and industrial research, diagnostics and biotechnology and textiles and dyeing.

Available in 10 g, 25 g, 100 g and 1 kg packs, Naphthol orange is dispatched with a Certificate of Analysis (COA) to destinations worldwide.

Typical applications

Histology & cytology staining
Microscopy
Clinical laboratories
Biological staining

Industries

Specifications & identifiers

Chemical identifiers
Product name	Naphthol orange
Catalogue No.	VQ-000646
CAS Number	523-44-4
IUPAC name	sodium 4-[(4-hydroxynaphthalen-1-yl)diazenyl]benzenesulfonate
Molecular formula	C₁₆H₁₁N₂NaO₄S
Molecular weight	350.3 g/mol
Exact mass	350.0337
Grade	Microscopy
HSN code	29420090
InChIKey	AZLXCBPKSXFMET-UHFFFAOYSA-M
SMILES	C1=CC=C2C(=C1)C(=CC=C2O)N=NC3=CC=C(C=C3)S(=O)(=O)[O-].[Na+]
PubChem CID	135513128

Physical properties
Physical form	Crystalline
Appearance	Orange to brown to dark red powder or crystals
H-bond donors / acceptors	1 / 6
TPSA	111 Å²
Synonyms	Benzenesulfonic acid, 4-(2-(4-hydroxy-1-naphthalenyl)diazenyl)-, sodium salt (1:1), Benzenesulfonic acid, 4-[2-(4-hydroxy-1-naphthalenyl)diazenyl]-, sodium salt (1:1), Orange I, C.I. Acid Orange 20, Sodium 4-((4-hydroxynaphthalen-1-yl)diazenyl)benzenesulfonate, Acid Orange 20, alpha-Naphthol orange, Acid Leather Orange I, Japan Orange 1, A.F. Orange No. 1, Yellow 404, Tropaeolin 1

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 orange?

The CAS Registry Number of Naphthol orange is 523-44-4. It is also known as Benzenesulfonic acid, 4-(2-(4-hydroxy-1-naphthalenyl)diazenyl)-, sodium salt (1:1), Benzenesulfonic acid, 4-[2-(4-hydroxy-1-naphthalenyl)diazenyl]-, sodium salt (1:1), Orange I.

What is the molecular formula and molecular weight of Naphthol orange?

Naphthol orange has the molecular formula C16H11N2NaO4S and a molecular weight of 350.3 g/mol. Its IUPAC name is sodium 4-[(4-hydroxynaphthalen-1-yl)diazenyl]benzenesulfonate.

Which grade and pack sizes of Naphthol orange can I order?

We supply Naphthol orange in Microscopy grade, in 10 g, 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 orange?

Yes. Every lot of Naphthol orange 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 orange be shipped internationally?

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