Official EU label nameGlossary entry 27209

SOLVENT ORANGE 1

This record confirms an official common ingredient name for EU cosmetic product labelling. It does not by itself confirm that the substance is permitted, unrestricted or safe.

Global evidence snapshot

The resolved identity has matching regulatory evidence in 0 of 13 indexed market datasets: 0 country records and 0 EU Annex records. Every result and evidence gap is listed below.

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Resolved identifiers

Resolved substance identity

CAS:2051-85-6

EC:218-131-9

Ingredient index records:

SOLVENT ORANGE 1

Cosmetic functions: HAIR DYEING

4-(Phenylazo)resorcinol (CI 11920)

Inventory restriction note: II/1343 (Solvent Orange 1; CI 11920: and its salts when used as a substance in hair dye products)

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1 matched or reported name

SOLVENT ORANGE 1

Regulatory evidence across markets

None of the 13 markets tracked here holds an imported rule under the name SOLVENT ORANGE 1.

That is a statement about this inventory, not about the law: no imported rule is not evidence that a substance is permitted. A rule may exist under a different name, under a CAS or EC number this glossary entry does not carry, or in a dataset not yet imported.

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Chemical identity and properties

PubChem 2D chemical structure for CAS 2051-85-6

CAS 2051-85-6PubChem CID 16325

4-(Phenylazo)resorcinol

IUPAC name: 4-phenyldiazenylbenzene-1,3-diol

Molecular formula: C12H10N2O2
Molecular weight: 214.22 g/mol
Exact mass: 214.074227566 Da
XLogP3: 3.0
Topological polar surface area: 65.2 Å²
Hydrogen-bond donors: 2
Hydrogen-bond acceptors: 4
Covalent units: 1
Defined stereocentres: 0

Also known as

2,4-Dihydroxyazobenzene1,3-Benzenediol, 4-(phenylazo)-1,3-Benzenediol, 4-(2-phenyldiazenyl)-RefChem:516611Sudan Orange GSolvent orange 1Ceres Orange GCeres Orange GN

16 more reported names

Sudan GFat Orange ABenzeneazoresorcinolC.I. Solvent Orange 1Sudan Yellow ARResinol Orange GFat Orange GSFat Orange RGCerisol Yellow GRGrasol Yellow RSFOrganol Orange 2JTertrogras Orange SGFat Victoria Yellow D1504 YellowC.I. Food Orange 3p-Phenylazoresorcinol

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External database identifiers

EPA DTXSID:DTXSID9062146
PubMed:20140918

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

Additional authoritative substance research

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Cosmetic Ingredient Review safety assessments FDA Global Substance Registration System ILO/WHO International Chemical Safety Cards Japan NITE-CHRIP NIOSH Pocket Guide to Chemical Hazards OECD eChemPortal US EPA CompTox CTX APIs

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Official source and scope

Imported from Commission Implementing Decision (EU) 2025/1175 (dataset version EU 2025/1175). The glossary supplies common ingredient names for the ingredient list required by Article 19(1)(g); it is not an approval or safety list.

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