Fat Red 7B

About Fat Red 7B

Fat Red 7B is a biological stain carrying the CAS registry number 6368-72-5. The compound has the formula C24H21N5, corresponding to a molecular weight of 379.5 g/mol. The IUPAC name is N-ethyl-1-[(4-phenyldiazenylphenyl)diazenyl]naphthalen-2-amine. Alternative names: Fat red bluish and Solvent Red 19.

It is supplied as orange to brown to dark brown powder or crystals. Literature values give a melting point of 140 °C. Store in a tightly closed container in a cool, dry and well-ventilated place. It carries the GHS signal word “Warning” with 1 hazard statement. Review the Safety Data Sheet before use.

Typical applications include histology and cytology staining, microscopy, clinical laboratories and pharmaceutical synthesis. Our customers for this product work in academic and industrial research, diagnostics and biotechnology and textiles and dyeing.

Standard pack sizes are 10 g and 50 g, and every batch ships with a Certificate of Analysis (COA) and we export worldwide.

Typical applications

Histology & cytology staining
Microscopy
Clinical laboratories
Pharmaceutical synthesis

Industries

Specifications & identifiers

Chemical identifiers
Product name	Fat Red 7B
Catalogue No.	VQ-000584
CAS Number	6368-72-5
IUPAC name	N-ethyl-1-[(4-phenyldiazenylphenyl)diazenyl]naphthalen-2-amine
Molecular formula	C₂₄H₂₁N₅
Molecular weight	379.5 g/mol
Exact mass	379.1797
HSN code	29420090
InChIKey	VKWNTWQXVLKCSG-UHFFFAOYSA-N
SMILES	CCNC1=C(C2=CC=CC=C2C=C1)N=NC3=CC=C(C=C3)N=NC4=CC=CC=C4
PubChem CID	61396

Physical properties
Physical form	Crystalline
Appearance	Orange to brown to dark brown powder or crystals
Melting point	140 °C
LogP (XLogP3)	7.1
H-bond donors / acceptors	1 / 5
TPSA	61.5 Å²
Synonyms	Fat red bluish, Solvent Red 19, Sudan Red 7B, Typogen Carmine, Ceres Red 7B, Hexatype Carmine B, Organol Bordeaux B, C.I. Solvent Red 19, Sudanrot 7B, Lacquer Red V3B, Sudan 7B, Solvent Red 019

Safety & hazard information (GHS)

Harmful / irritant

Signal word: Warning

Hazard statements

H302Harmful if swallowed

Precautionary statements: P264, P270, P301 + P317, P330, 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 Fat Red 7B?

The CAS Registry Number of Fat Red 7B is 6368-72-5. It is also known as Fat red bluish, Solvent Red 19, Sudan Red 7B.

What is the molecular formula and molecular weight of Fat Red 7B?

Fat Red 7B has the molecular formula C24H21N5 and a molecular weight of 379.5 g/mol. Its IUPAC name is N-ethyl-1-[(4-phenyldiazenylphenyl)diazenyl]naphthalen-2-amine.

Which grade and pack sizes of Fat Red 7B can I order?

We supply Fat Red 7B, in 10 g, 50 g packs. Larger bulk quantities and custom packing are quoted on request.

Do you provide a COA and SDS with Fat Red 7B?

Yes. Every lot of Fat Red 7B 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 Fat Red 7B be shipped internationally?

Yes. Fat Red 7B 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.