Why does CAS 85-86-9 appear in more than one EU cosmetic annex?

A substance identified by CAS 85-86-9 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 85-86-9?

Use the INCI Checker on CosIng Checker with INCI names, CAS numbers or EC numbers. Paste CAS 85-86-9 to screen it directly, then review every linked annex record and supplier document.

CAS 2 records

CAS 85-86-9

Q: How do I use CAS 85-86-9 for compliance screening?

Cross-reference CAS 85-86-9 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 85-86-9 matches 2 EU annex records across Annex II–VI of Regulation 1223/2009.

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Chemical identity and properties

PubChem 2D chemical structure for CAS 85-86-9

CAS 85-86-9PubChem CID 62331

1-(p-Phenylazophenylazo)-2-naphthol (Sudan III)

Sudan III is a bis(azo) compound that is 2-naphthol substituted at position 1 by a 4-{[(2-methylphenyl)diazenyl]phenyl}diazenyl group. A fat-soluble dye predominantly used for demonstrating triglycerides in frozen sections, but which may also stain some protein bound lipids in paraffin sections. It has a role as a carcinogenic agent, a fluorochrome and a histological dye. It is a member of azobenzenes, a member of naphthols and a bis(azo) compound. It is functionally related to a 2-naphthol. — ChEBI

IUPAC name: 1-[(4-phenyldiazenylphenyl)diazenyl]naphthalen-2-ol

Molecular formula: C22H16N4O
Molecular weight: 352.4 g/mol
Exact mass: 352.13241115 Da
XLogP3: 5.9
Topological polar surface area: 69.7 Å²
Hydrogen-bond donors: 1
Hydrogen-bond acceptors: 5
Covalent units: 1
Defined stereocentres: 0

Also known as

Sudan IIISolvent red 23C.I. Solvent Red 23Toney RedFettponceau GCerasin RedFat Scarlet LBFettscharlach

16 more reported names

CerasinrotFettrotSudan Red IIIRouge cerasineStearix ScarletPyronalrot BSudan P IIIFettscharlach LBOrganol Red BSSoudan IIICerotinscharlach RSomalia Red IIIMotirot 2RSudan Red BKFat Red RFat Red HRR

Open full PubChem record PubChem annotations 3D structure image

External database identifiers

ChEBI:CHEBI:82535
ChEMBL:CHEMBL2001927
EPA DTXSID:DTXSID3041742
PubMed:39703340
PubMed:37813177
PubMed:22287322
PubMed:20308224
PubMed:18418879
PubMed:17598027
PubMed:15822858
PubMed:15788368
PubMed:15585952
PubMed:1282215

Retrieved from NIH PubChem on 2026-08-31 by checksum-valid CAS matching. Chemical properties do not replace the regulatory decision on this page.

Records for CAS 85-86-9

2 total

Annex

Entry

1353

1-((4-Phenylazo)phenylazo)-2-naphthol (Solvent Red 23; CI 26100) when used as a substance in hair dye products

201-638-4

Annex

Entry

CI 26100 /SOLVENT RED 23

1-(4-(Phenylazo)phenylazo)-2-naphthol

Purity criteria: anilin

201-638-4

Max concentration

How CAS 85-86-9 is used on this site

CAS 85-86-9 is the Chemical Abstracts Service identifier used to pin this page to a specific substance. In the current dataset, 2 EU annex records share 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 85-86-9 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 85-86-9 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.

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