CosIng Checker
CosIng Checker
EU cosmetic ingredients, restrictions and safety
Login
Annex III Entry 16 09/09/2013

1-Naphthol

1- Naphthalenol

1-Naphthol is listed in Annex III and may only be used under the conditions shown in this record.

Search similar Back to annex Compare
Restricted substance— Annex III, EU Regulation 1223/2009
Entry: 16

Chemical identity and properties

PubChem 2D chemical structure for CAS 90-15-3
CAS 90-15-3PubChem CID 7005

1-Naphthol

1-naphthol is a naphthol carrying a hydroxy group at position 1. It has a role as a genotoxin and a human xenobiotic metabolite. — ChEBI

IUPAC name
naphthalen-1-ol
Molecular formula
C10H8O
Molecular weight
144.17 g/mol
Exact mass
144.057514874 Da
XLogP3
2.8
Topological polar surface area
20.2 Ų
Hydrogen-bond donors
1
Hydrogen-bond acceptors
1
Covalent units
1
Defined stereocentres
0

Also known as

alpha-naphthol1-Naphthalenol1-HydroxynaphthaleneFurro ERUrsol ERNFouramine ERNFourrine ERNTertral ERN
16 more reported names
Basf Ursol ERNFourrine 99Nako TRBZoba ERNalpha-HydroxynaphthaleneDurafur developer DC.I. Oxidation Base 33CI Oxidation Base 33C.I. 76605CI 76605CHEBI:103192A71EAQ389NSC-9586RefChem:76531201-969-4NAPHTHOL
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.

Record details

Product type

Hair dye substance in oxidative hair dye products

Other restrictions

After mixing under oxidative conditions the maximum concentration applied to hair must not exceed 2,0%

Warnings

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

INCI glossary name

1-Naphthol

Chemical name

1- Naphthalenol

Chemical / IUPAC name

1- Naphthalenol

Regulatory information

Regulation

(EU) 2013/658

Key data

CAS
90-15-3
EC
201-969-4
Annex
III
Entry number
16

Inventory links for 1-Naphthol

Inventory Restriction reference
Ref 31470

1-NAPHTHOL

CAS: 90-15-3
EC: 201-969-4
Annex III 16
Shared CAS number

1-NAPHTHOL

CAS: 90-15-3
EC: 201-969-4
Annex III 193
Shared product type

ACID RED 52

CAS: 3520-42-1
EC: 222-529-8

What Annex III means for 1-Naphthol

1-Naphthol is a restricted substance under Annex III of EU Cosmetics Regulation 1223/2009. Its use in cosmetics is only permitted under the specific conditions set out in the entry above, including applicable concentration limits, product type restrictions and required warning statements.

When including this substance in a formulation, all conditions — maximum concentration, product scope and warning labels — must be met simultaneously. Compliance with one condition does not override the others.

This record is linked to 1 CosIng inventory ingredient for name and identifier cross-reference. The page also surfaces 12 related annex records with overlapping identifiers, annex logic or naming patterns.

Compliance checklist

  • Confirm product type compatibility: Hair dye substance in oxidative hair dye products
  • Include required warning statement on product label.
  • Document conditions of use in the Product Information File (PIF).

Frequently asked questions

1-Naphthol is listed in Annex III of EU Regulation 1223/2009 as a restricted substance. It may only be used under the conditions specified in the entry, including any maximum concentration, product type limitation and required warning statements shown above.

CAS 90-15-3 is the unique numerical identifier assigned to 1-Naphthol by the Chemical Abstracts Service. In cosmetic compliance work, the CAS number is used to cross-reference the substance across regulatory databases, raw material specifications and safety assessment reports. Multiple EU annex entries may share the same CAS number if the same substance appears under different conditions or in different annexes.

Use the INCI Checker tool on this site to paste your full ingredient list (INCI) and scan it against all Annex II–VI entries. The tool highlights any ingredients that match restricted, prohibited or allergen-flagged records. This is useful for rapid compliance screening of finished product formulas or raw material declarations.
Open INCI Checker

Source note for Annex III record 1-Naphthol

This page summarizes one Annex III record for 1-Naphthol from public European Commission cosmetic materials and adds linked inventory or identifier matches when available.

Use this record page to review Annex III conditions for 1-Naphthol, but confirm any final regulatory decision against the current official annex wording and source files.

View sourcesView updates

Tools & next steps

Check your formula

Paste a full INCI list to detect 1-Naphthol and other flagged EU annex records in one pass.

INCI Checker

Compare entries

Compare 1-Naphthol side by side with another annex record to review differences in restrictions, concentrations and annex placement.

Compare

Browse the annex

See all records in Annex III and compare regulatory conditions across substances in this annex.

Open Annex III