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CI 26100

CAS 85-86-9 · 100/100 · High conf.

Concern score

100/100Critical concern based on regulatory listings.
High confidence

CI 26100 in plain language

What it is

On cosmetic ingredient lists it appears as “Solvent red 23”.

Also known as Solvent red 23 · Sudan iii · D & c red #17 · 1-(4-(Phenylazo)phenylazo)-2-naphthol · C.I. Solvent Red 23 · D&C red no. 17

Show all 27 names

AKA225 · Red 17 · 2-NAPHTHOL, 1-(P-PHENYULAZOPHENYLAZO)- · CI 26100 /solvent red 23 · Dc red no. 17 · Sudan red bk · Tetrazobenzene-beta-naphthol · 1-(4-(Phenylazo)phenylazo)-2-naphthol (CI 26100) · 1-(p-Phenylazophenylazo)-2-naphthol (Sudan III) · 111440 Red · 2-NAPHTHALENOL, 1-((4-(PHENYLAZO)PHENYL)AZO)- · A204 tudor phlox · C.I. 26100 · D & c red NO.17 K7007 · D&C red dye no 17 · DC Red 17 · Disazo · Japan Red No. 225 · Oil Red 3G · Oil Red Extra · sudan i i i

What it does

Used in cosmetics as a colourant and a hair dye. CI 26100 is classed chemically as a disazo colour.

  • Colorant
  • Hair dyeing
  • Colourant
  • Fragrance
Is it a concern?
Critical concern: no hazard classifications on record. It is banned in EU cosmetics.

Why it's flagged

1-((4-Phenylazo)phenylazo)-2-naphthol (Solvent Red 23; CI 26100) when used as a substance in hair dye products is prohibited in cosmetic products under Annex II of the EU Cosmetics Regulation (EC) 1223/2009.

RestrictedEU EC — banned

The score describes this ingredient's chemical identity — its hazard profile from published classifications and regulatory status — not the safety of any product it appears in.

Regulation

Restrictions first, then routine listings from published regulatory sources.

  • EU Annex II — prohibited
  • EU Annex IV — permitted colorant
  • EU permitted colorant
  • EU prohibited in cosmetics

Recorded in these product areas

  • Found in consumer products
  • Beauty
  • Pharma
  • Food
  • Industrial

  • EUEC

    Annex II of EU Cosmetics Regulation (EC) 1223/2009: substances prohibited in cosmetic products.

    banned
    View source →
  • EUCosIngActive4 entries
    • Cosmetics Regulation annex II / ref 1353.Source →
    • Cosmetics Regulation annex IV / ref 51.Source →
    • CI 26100 is classed chemically as a disazo colour. It conforms to the formula: Restriction: IV/51 (CI 26100) II/1353 (Solvent Red 23; CI 26100: when used as a substance in hair dye products)Source →
    • Solvent Red 23 is classed chemically as a disazo colour. It conforms to the formula: Restriction: II/1353 (Solvent Red 23; CI 26100: when used as a substance in hair dye products)Source →
  • EUECallowed_listedAnnex IV of EU Cosmetics Regulation (EC) 1223/2009: colorants allowed in cosmetic products. Maximum concentration: Not to be used in products applied on mucous membranes Conditions of use and warnings: Purity criteria: anilin
    • Annex IV of EU Cosmetics Regulation (EC) 1223/2009: colorants allowed in cosmetic products. Maximum concentration: Not to be used in products applied on mucous membranes Conditions of use and warnings: Purity criteria: anilinSource →
  • EUEFSAEFSA opinionOpinion of the Scientific Panel on Food Additives, Flavourings, Processing Aids and Materials in Contact with Food on a request from the Commission to Review the toxicology of a number of dyes illegally present in food in the EU (EFSA AFC)
    • Opinion of the Scientific Panel on Food Additives, Flavourings, Processing Aids and Materials in Contact with Food on a request from the Commission to Review the toxicology of a number of dyes illegally present in food in the EU (EFSA AFC)Source →
  • USEPAcommercial use observedEPA CPDat observed this chemical in 25 composition records across product categories including Laboratory supplies, Food and drug, Personal care. EPA CPDat classifies this chemical for functional uses including Dye, Fragrance.
    • EPA CPDat observed this chemical in 25 composition records across product categories including Laboratory supplies, Food and drug, Personal care. EPA CPDat classifies this chemical for functional uses including Dye, Fragrance.Source →
  • USFDAlisted in openFDA substanceopenFDA substance registry classifies this ingredient as chemical.
    • openFDA substance registry classifies this ingredient as chemical.Source →

Expert safety opinions

Independent scientific assessments cited by the records we hold, with the year and link where the record gives one.

  • SCCS

    EU Scientific Committee on Consumer Safety

    No SCCS opinion on file.

  • CIR

    Cosmetic Ingredient Review (US expert panel)

    No CIR safety assessment on file.

  • EFSA

    European Food Safety Authority

    • Opinion of the Scientific Panel on Food Additives, Flavourings, Processing Aids and Materials in Contact with Food on a request from the Commission to Review the toxicology of a number of dyes illegally present in food in the EU (EFSA AFC)

      2005 · EU EFSA listing · Read the source →

Evidence & sources

No graded research studies for CI 26100 yet. This record is compiled from the published data sources below — registries and regulatory listings, not study findings.

7 data sources

Where this comes from

  • CosIng

    regulatory · updated 2026-09-23

    Open →

  • EU CosIng Cosmetics Regulation Annexes

    regulatory · updated 2020-08-13

    Open →

  • EFSA OpenFoodTox

    regulatory · updated 2026-10-04

    Open →

  • EPA Chemical and Products Database

    exposure · updated june 26, 2013

    Open →

  • EPA DSSTox Identifiers

    chemistry · updated 2025-12-29

    Open →

  • FDA GSRS UNII

    registry · updated 2026-02-26

    Open →

  • openFDA Substance

    registry · updated 2026-05-24

    Open →

Suitability

Context-specific fit derived from published classifications and the current ingredient evidence profile.

Food use

Food-use source coverage is present in the current record.

Good fit

The ingredient appears in food-oriented source coverage or allowed-use references, which makes food use easier to support than a context with no domain signal at all.

Fragrance avoidance

Not a strong fit for fragrance avoidance because it carries Fragrance.

Avoid

The ingredient itself is a fragrance-linked signal, so it is better treated as an avoid case when fragrance exposure is the main concern.

Where it has been recorded

How often EPA CPDat has listed CI 26100 in a product composition. These are source records, not Greenveil catalog products.

Source records

25

Named organisations

6

Laboratory suppliesFood and drugPersonal careConstruction

Typical roles

ColorantHair dyeingColourantFragrance
See products using CI 26100 →

Catalog

Found in these products

Their ingredient lists include CI 26100; each product's own rating depends on its whole formula, so it is shown on the product page, not here.

See all 44 →Find products without it →