Solvent Red 1 (CI 12150), when used as a substance in hair dye products
Solvent Red 1 (CI 12150), when used as a substance in hair dye products is listed in Annex II as a prohibited substance for cosmetic products placed on the EU market.
Chemical identity and properties
Sudan R
- IUPAC name
- 1-[(2-methoxyphenyl)diazenyl]naphthalen-2-ol
- Molecular formula
- C17H14N2O2
- Molecular weight
- 278.30 g/mol
- Exact mass
- 278.105527694 Da
- XLogP3
- 4.6
- Topological polar surface area
- 54.2 Ų
- Hydrogen-bond donors
- 1
- Hydrogen-bond acceptors
- 4
- Covalent units
- 1
- Defined stereocentres
- 0
Also known as
16 more reported names
External database identifiers
- ChEMBL:CHEMBL1986529
- EPA DTXSID:DTXSID3061635
Evidence from additional scientific databases
NIH PubChem PUG-View
Attributed physical-property, hazard, environmental and use annotations.
- Uses: Substance listed with specific concentration in tattoo ink and/or permanent make up according to EU Commission Regulation 2020/2081. The concentration limit (by weight) is 0.1%. Source: NORMAN Suspect List Exchange
Mapped by: Existing checksum-valid CAS to unique PubChem CID match. Retrieved: 2026-08-31. Open source record
Scientific classifications and hazard annotations provide context and do not replace the market-specific regulatory decision shown above.
Additional source coverage and match status
| Source | Result | Checked |
|---|---|---|
| NIH PubChem PUG-View | Exact match | 2026-08-31 |
A recorded no-match is useful evidence that the source was checked; it is not a claim that the substance does not exist elsewhere.
Retrieved from NIH PubChem on 2026-09-02 by checksum-valid CAS matching. Chemical properties do not replace the regulatory decision on this page.
Record details
Chemical name
Solvent Red 1 (CI 12150), when used as a substance in hair dye products
Regulatory information
SCCS opinions
- Opinion concerning Use of Permanent Hair Dyes and Bladder Cancer - Updated 2004
- Opinion concerning Hair Dyes without File submitted
- Opinion on Personal Use of Hair Dyes and Cancer Risk
- Opinion on the Use of Permanent Hair Dyes and Bladder Cancer Risk
- Assessment Strategies for Hair Dyes
- Opinion concerning The Safety Review of the Use of certain Azo-Dyes in Cosmetic Products
Identified ingredients
Key data
Inventory links for Solvent Red 1 (CI 12150), when used as a substance in hair dye products
Related records for Solvent Red 1 (CI 12150), when used as a substance in hair dye products
Direct matches are limited for this record, so nearby entries from Annex II are shown as well.
2-Aminomethyl-p-aminophenol and its HCl salts, when used as a substance in hair dye products
Acid Orange 24 (CI 20170), when used as a substance in hair dye products
3,4-Diaminobenzoic acid, when used as a substance in hair dye products
Acid Red 73 (CI 27290), when used as a substance in hair dye products
1,7-Naphthalenediol, when used as a substance in hair dye products
2,4-Diamino-5-methylphenetol and its HCl salt, when used as a substance in hair dye products
N-(2-Methoxyethyl)-p-phenylenediamine and its HCl salt, when used as a substance in hair dye produc…
N-Cyclopentyl-m-aminophenol, when used as a substance in hair dye products
What Annex II means for Solvent Red 1 (CI 12150), when used as a substance in hair dye products
Solvent Red 1 (CI 12150), when used as a substance in hair dye products is listed as a prohibited substance under Annex II of EU Cosmetics Regulation 1223/2009 and must not be intentionally added. Article 17 separately addresses unintended small quantities that are technically unavoidable under good manufacturing practice and compatible with the Article 3 safety requirement.
Formulators must screen their ingredients and raw materials to ensure none contain this substance. Suppliers should provide documentation confirming absence when requested.
This record is linked to 2 CosIng inventory ingredients for name and identifier cross-reference. The page also surfaces 12 related annex records with overlapping identifiers, annex logic or naming patterns.
Compliance checklist
- Verify this substance is absent from all raw materials and finished formulations.
- Request absence confirmation or CoA from raw material suppliers.
- Document the screening result in the Product Information File (PIF).
Frequently asked questions
Source note for Annex II record Solvent Red 1 (CI 12150), when used as a substance in hair dye products
This page summarizes one Annex II record for Solvent Red 1 (CI 12150), when used as a substance in hair dye products from public European Commission cosmetic materials and adds linked inventory or identifier matches when available.
Use this record page to review Annex II conditions for Solvent Red 1 (CI 12150), when used as a substance in hair dye products, but confirm any final regulatory decision against the current official annex wording and source files.
Tools & next steps
Check your formula
Paste a full INCI list to detect Solvent Red 1 (CI 12150), when used as a substance in hair dye products and other flagged EU annex records in one pass.
INCI CheckerCompare entries
Compare Solvent Red 1 (CI 12150), when used as a substance in hair dye products side by side with another annex record to review differences in restrictions, concentrations and annex placement.
CompareBrowse the annex
See all records in Annex II and compare regulatory conditions across substances in this annex.
Open Annex II