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Official EU label nameGlossary entry 870

ACID RED 51

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.

0 markets with evidence
Markets checked
13
Markets with evidence
0
Evidence gaps
13
Resolved identifiers
3

Resolved substance identity

CAS:16423-68-01342-25-2
EC:240-474-8
Ingredient index records:
ACID RED 51
Cosmetic functions: COLORANT, HAIR DYEING

Disodium 2-(2,4,5,7-tetraiodo-6-oxido-3-oxoxanthen-9-yl)benzoate (CI 45430)

Inventory restriction note: II/1337 (when used as a substance in hair dye products)

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2 matched or reported names
ACID RED 51erythrosine

Regulatory evidence across markets

None of the 13 markets tracked here holds an imported rule under the name ACID RED 51.

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 1342-25-2
CAS 1342-25-2PubChem CID 704905

N2-(4-Bromophenyl)-1,3,5-triazine-2,4-diamine

IUPAC name
2-N-(4-bromophenyl)-1,3,5-triazine-2,4-diamine
Molecular formula
C9H8BrN5
Molecular weight
266.10 g/mol
Exact mass
264.99631 Da
XLogP3
2.2
Topological polar surface area
76.7 Ų
Hydrogen-bond donors
2
Hydrogen-bond acceptors
5
Covalent units
1
Defined stereocentres
0

Also known as

N-(4-Bromo-phenyl)-[1,3,5]triazine-2,4-diaminen-(4-bromophenyl)-1,3,5-triazine-2,4-diamineCCG-274101CS-0284738EN300-06463SR-01000028696SR-01000028696-1(4-amino(1,3,5-triazin-2-yl))(4-bromophenyl)amine
1 more reported name
1,3,5-Triazine-2,4-diamine, N2-(4-bromophenyl)-
Open full PubChem recordPubChem annotations3D structure image
External database identifiers

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

PubChem 2D chemical structure for CAS 16423-68-0
CAS 16423-68-0PubChem CID 3259

Erythrosine

Fd&c red no. 3 is used as a food additive [EAFUS] ("EAFUS: Everything Added to Food in the United States. [http://www.eafus.com/]").<br /> Fd&c red no. 3 belongs to the family of Xanthenes. These are polycyclic aromatic compounds containing a xanthene moiety, which consists of two benzene ring joined to each other by a pyran ring. — Toxin and Toxin Target Database (T3DB)

IUPAC name
3',6'-dihydroxy-2',4',5',7'-tetraiodospiro[2-benzofuran-3,9'-xanthene]-1-one
Molecular formula
C20H8I4O5
Molecular weight
835.9 g/mol
Exact mass
835.6551 Da
XLogP3
6.0
Topological polar surface area
76.0 Ų
Hydrogen-bond donors
2
Hydrogen-bond acceptors
5
Covalent units
1
Defined stereocentres
0

Also known as

E127FD & C red no. 33',6'-dihydroxy-2',4',5',7'-tetraiodospiro(2-benzofuran-3,9'-xanthene)-1-oneFDC Red No. 3RefChem:591122Spiro(isobenzofuran-1(3H),9'-(9H)xanthen)-3-one, 3',6'-dihydroxy-2',4',5',7'-tetraiodo-, disodium saltErythrosine, sodium anhydrousNSC-36685
16 more reported names
Erythrosin BTetraiodofluoresceinSolvent Red 140IodeosinErythrosine acidErythrosine, phenolic2',4',5',7'-Tetraiodofluorescein2,4,5,7-ErythrosinC.I. Solvent Red 140Spiro[isobenzofuran-1(3H),9'-[9H]xanthen]-3-one, 3',6'-dihydroxy-2',4',5',7'-tetraiodo-Erythrosine B (free acid)1A878FZQ9BNSC-328781Spiro(isobenzofuran-1(3H),9'-(9H)xanthen)-3-one, 3',6'-dihydroxy-2',4',5',7'-tetraiodo-C.I. Food Red 14FD and C Red No. 3
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External database identifiers

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

Each link searches that source for this identity. A link is a research route, not a claim that the source holds an exact record. What each source is, and its legal weight

Cosmetic Ingredient Review safety assessmentsFDA Global Substance Registration SystemILO/WHO International Chemical Safety CardsJapan NITE-CHRIPNIOSH Pocket Guide to Chemical HazardsOECD eChemPortalUS 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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