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CI 26100

Also known as 1-(4-(Phenylazo)phenylazo)-2-naphthol

CAS 85-86-9EC 201-638-4PubChem CID 62331

COLORANTRoutine

What it is and how it is used

Colorant (Solvent Red 23); subject to specific limits in hair dye products.

Status in national inventories

EU · CosIng32744功能 COLORANT · 限制 IV/51 (CI 26100) II/1353 (Solvent Red 23; CI 26100: when used as a substance in hair dye products)
ASEAN · Cosmetic DirectiveASEAN-IV/26100附录 IV 准用着色剂 · Ref 26100 · CI 26100 · Red · Purity criteria: aniline ≤ 0.2% 2-naphtol ≤ 0.2% 4-aminoazobenzene ≤ 0.1%

Matched on the exact INCI name; salts, esters and synonyms may be missed. The latest official text prevails.

Regulatory status by market Prohibited / restricted / permitted — listing is not approval

Asia-Pacific

MarketStatusConditions (as published)Source
ASEANASEAN Cosmetic Committee
Applies in 10 countries / territories

Singapore · Thailand · Malaysia · Indonesia · Philippines · Vietnam · Brunei · Cambodia · Laos · Myanmar

PermittedColorantACD Annex IV附录 IV 准用着色剂 · Ref 26100 · CI 26100 · Red · Purity criteria: aniline ≤ 0.2% 2-naphtol ≤ 0.2% 4-aminoazobenzene ≤ 0.1%ASEAN Cosmetic Directive Annexes rel. 2026-06-10 (NPRA)C · Official source
KoreaMFDSRestricted화장품 사용제한 원료
구분: 한도/금지; 표준명: CI 26100; CASNo: 85-86-9; 이명: 2-Naphthalenol, 1-[[4-(Phenylazo)Phenyl]Azo]-, 2-Naphthol, 1-(p-phenyulazophenylazo)-, 1-[[4-(Phenylazo)Phenyl]Azo… Show full text

구분: 한도/금지; 표준명: CI 26100; CASNo: 85-86-9; 이명: 2-Naphthalenol, 1-[[4-(Phenylazo)Phenyl]Azo]-, 2-Naphthol, 1-(p-phenyulazophenylazo)-, 1-[[4-(Phenylazo)Phenyl]Azo]-2-Naphthalenol, Red No. 225, Solvent Red 23, Sudan III, Sudan Red BK, Tetrazobenzene-beta-Naphthol; 영문명: CI 26100

kr-mfdsC · Official source

Americas

MarketStatusConditions (as published)Source
MercosurGrupo Mercado Común
Applies in 4 countries / territories

Brazil · Argentina · Uruguay · Paraguay

PermittedColorantGMC 16/12 (colorantes) CI 26100Res. GMC 16/12 · ROJO · X · Criterios de pureza: anilina ≤ 0,2% 2-naftol ≤ 0,2% 4-aminoazobenzeno ≤ 0,1% 1-(fenilazo)-2-naftol ≤ 3% 1-[[2-(fenilazo) fenil]azo]-2-naftalenol ≤ 2%Res. GMC 16/12 Lista de colorantes · normas.mercosur.intC · Official source
MexicoCOFEPRISPermittedColorantAcuerdo DOF numeral SEXTO (colorantes) nº 69SEXTO · 26100 · Rojo solvente 23 · 1-[[4-(fenilazo)fenil]azo]-2- naftalenol D&C Rojo17 Ponceau grado G Rojo 17 Rojo No. 17 Rojo No. 225 Rojo toney Sudán III Tetrazobenceno-beta-naftol · No se podrá emplear en productos que entren en contacto con las mucosas.Acuerdo sustancias prohibidas y restringidas en productos deC · Official source

EMEA

MarketStatusConditions (as published)Source
United KingdomOPSSPermittedColorantUK Annex IV
1-(4-(Phenylazo)phenylazo)-2-naphthol · 26100 · Red · Not to be used in products applied on mucous membranes · Purity criteria: · aniline ≤ 0,2 % · 2-naphtol ≤ … Show full text

1-(4-(Phenylazo)phenylazo)-2-naphthol · 26100 · Red · Not to be used in products applied on mucous membranes · Purity criteria: · aniline ≤ 0,2 % · 2-naphtol ≤ 0,2 % · 4-aminoazobenzene ≤ 0,1 % · 1-(phenylazo)-2-naphtol ≤ 3 % · 1-[2-(phenylazo)phenylazo]-2-napthalenol ≤ 2 % · UK Annex IV · No 51

UK Cosmetics Regulation (assimilated Regulation (EC) No 1223C · Official source

Public regulatory text on file for 5 jurisdiction(s), covering 19 countries / territories once regional blocs are expanded. Other markets have no public data here — absence is neither approval nor prohibition. Table updated 2026-09-22.

Compiled from publicly published regulatory texts; conditions are reproduced as published, neither rewritten nor translated. The latest official announcement of the target market prevails — this table is a compiled reference, not a compliance conclusion. Matched on the INCI name; salts, esters and synonyms may be missed. Usability and labelling are for the brand and its responsible person to verify against the full text.

Popular products with this ingredient 12 products

Functions from EU CosIng and the China inventory; irritancy, comedogenicity and rating are our internal reading, not a regulatory conclusion. Structure and molecular data from PubChem.

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