Why does CAS 4197-25-5 appear in more than one EU cosmetic annex?

A substance identified by CAS 4197-25-5 may appear in multiple EU cosmetic regulation annexes when it is subject to different conditions in different contexts — for example, restricted under Annex III with specific conditions, while also appearing in Annex IV as an approved colorant under separate entry conditions. Each entry must be reviewed individually.

How do I check if my formula contains a substance with CAS 4197-25-5?

Use the INCI Checker on CosIng Checker with INCI names, CAS numbers or EC numbers. Paste CAS 4197-25-5 to screen it directly, then review every linked annex record and supplier document.

CAS 1 record

CAS 4197-25-5

Q: How do I use CAS 4197-25-5 for compliance screening?

Cross-reference CAS 4197-25-5 against your raw material specification sheets and CoA documents. When it appears in Annex II, verify absence. When it appears in Annex III, verify that concentration limits and product type conditions are met. All annex entries sharing this CAS number are listed on this page.

CAS 4197-25-5 matches 1 EU annex record across Annex II–VI of Regulation 1223/2009.

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Chemical identity and properties

PubChem 2D chemical structure for CAS 4197-25-5

CAS 4197-25-5PubChem CID 61336

Sudan Black B

Sudan black B is a member of the class of perimidines that is 2,2-dimethyl-2,3-dihydro-1H-perimidine carrying a [4-(phenyldiazenyl)naphthalen-1-yl]diazenyl substituent at position 6. A fat-soluble dye predominantly used for demonstrating triglycerides in frozen sections and for staining of protein bound lipids in paraffin sections. It has a role as a histological dye. It is a member of azobenzenes, a member of perimidines and a bis(azo) compound. — ChEBI

IUPAC name: (2,2-dimethyl-1,3-dihydroperimidin-6-yl)-(4-phenyldiazenylnaphthalen-1-yl)diazene

Molecular formula: C29H24N6
Molecular weight: 456.5 g/mol
Exact mass: 456.20624479 Da
XLogP3: 8.4
Topological polar surface area: 73.5 Å²
Hydrogen-bond donors: 2
Hydrogen-bond acceptors: 6
Covalent units: 1
Defined stereocentres: 0

Also known as

Fat Black HBC.I. Solvent Black 3Ceres Black BNFast Black HBTypogen BlackLacquer Black SNubian Black BTHexatype Black B

16 more reported names

Lacquer Black VBFast Black HBNSudan Deep Black BBSudan Deep Black BNC.I. 26150Aizen SOT Black 6Sudan Black X 60Fat Black HB 01Neptune Black X 60CHEBI:88216RefChem:889476Solvent black 3Sudan BlackSOT-Black 6CI 26150NSC 11239

Open full PubChem record PubChem annotations 3D structure image

External database identifiers

ChEBI:CHEBI:88216
ChEMBL:CHEMBL1872445
EPA DTXSID:DTXSID0052091

Retrieved from NIH PubChem on 2026-09-02 by checksum-valid CAS matching. Chemical properties do not replace the regulatory decision on this page.

Records for CAS 4197-25-5

1 total

Annex

Entry

1265

2,3-Dihydro-2,2-dimethyl-6-[(4-(phenylazo)-1-naphthelenyl)azo]-1H-pyrimidine (Solvent Black 3) and its salts, when used as a substance in hair dye products

224-087-1

How CAS 4197-25-5 is used on this site

CAS 4197-25-5 is the Chemical Abstracts Service identifier used to pin this page to a specific substance. In the current dataset, 1 EU annex record shares this identifier, which helps you cross-check whether the same substance appears under one regulatory context or several.

Use this page when a supplier specification, SDS or raw-material dossier gives you CAS 4197-25-5 and you need to see every linked Annex II–VI record in one place. The entry cards above are the quickest route to concentration limits, warnings, annex placement and product-type conditions.

Frequently asked questions

A substance identified by CAS 4197-25-5 may appear in multiple EU cosmetic regulation annexes when it is subject to different conditions in different contexts. For example, a substance might be restricted under Annex III with specific conditions, and the same CAS might also appear in Annex IV as an approved colorant under separate entry conditions. Each entry must be reviewed individually.

Cross-reference the CAS number against your raw material specification sheets and CoA documents. When a CAS appears in Annex II, verify absence. When it appears in Annex III, verify that concentration limits and product type conditions are met in your formulation. All annex entries sharing this CAS number are listed above.

A CAS number is assigned by the Chemical Abstracts Service (USA) and is globally recognised. An EC number is a European Commission identifier from inventories such as EINECS, ELINCS or the NLP list. Both identifiers may appear in EU cosmetic annex entries. Some substances have both, some have only one, and some older entries may have neither.

The INCI Checker accepts ingredient names, CAS numbers and EC numbers. Check this CAS number directly, then verify the result against supplier specification sheets and every linked annex condition.

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