Why does CAS 846-70-8 appear in more than one EU cosmetic annex?

A substance identified by CAS 846-70-8 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 846-70-8?

Use the INCI Checker on CosIng Checker with INCI names, CAS numbers or EC numbers. Paste CAS 846-70-8 to screen it directly, then review every linked annex record and supplier document.

CAS 2 records

CAS 846-70-8

Q: How do I use CAS 846-70-8 for compliance screening?

Cross-reference CAS 846-70-8 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 846-70-8 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 846-70-8

CAS 846-70-8PubChem CID 2724063

Acid Yellow 1

Naphthol yellow S is an organic sodium salt that is the disodium salt of 5,7-dinitro-8-hydroxynaphthalene-2-sulfonic acid. It has a role as a histological dye. It contains a flavianate. — ChEBI

IUPAC name: disodium;5,7-dinitro-8-oxidonaphthalene-2-sulfonate

Molecular formula: C10H4N2Na2O8S
Molecular weight: 358.19 g/mol
Exact mass: 357.94837483 Da
Topological polar surface area: 180.0 Å²
Hydrogen-bond donors: 0
Hydrogen-bond acceptors: 8
Covalent units: 3
Defined stereocentres: 0

Also known as

Naphthol Yellow SSodium flavianateAcid Yellow SC.I. Acid Yellow 1Flavianic acid disodium saltAmacid Yellow SC.I. Food Yellow 1Kiton Yellow S

16 more reported names

Paper Yellow LZlut naftolova SNaphtol Yellow SSolar Yellow NYZlut kysela 1Calcocid Yellow SNaphthol Yellow LYellow Lake 71Naphthol Yellow OSNaphthol Yellow PLNaphtocard Yellow SHispacid Yellow NSFNaphthol Yellow SNANaphthol Yellow SXXExt D&C Yellow 7Naphthol Yellow S.FQ

Open full PubChem record PubChem annotations 3D structure image

External database identifiers

ChEBI:CHEBI:87219
EPA DTXSID:DTXSID1041718

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 846-70-8

2 total

Annex

III

Entry

214

ACID YELLOW 1

Disodium 5,7-dinitro-8-oxido-2- naphthalenesulfonate CI 1036

To be printed on the label: Hair colorants can cause severe allergic reactions

212-690-2

Max concentration

Annex

Entry

CI 10316

Disodium 5,7-dinitro-8-oxidonaphthalene-2-sulphonate and its insoluble barium, strontium and zirconium lakes, salts and pigments

212-690-2

Max concentration

How CAS 846-70-8 is used on this site

CAS 846-70-8 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 846-70-8 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 846-70-8 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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