What does the restriction note for SOLVENT RED 1 mean?

The restriction field for SOLVENT RED 1 reads: II/1231. This is the restriction note from the CosIng inventory. For authoritative conditions and limits, always refer to the linked annex entries.

What other records share CAS 1229-55-6?

CAS 1229-55-6 may appear across multiple EU annex records. The CAS lookup page shows all Annex II–VI entries sharing this identifier, useful for identifying cross-annex regulatory status of the same chemical substance.

How do I check if my formula contains SOLVENT RED 1?

Use the INCI Checker to screen a full ingredient list across selected markets, or use the substance market comparison to review this identity across all supported market datasets.

InventoryRef 4171015/10/2010

SOLVENT RED 1

1-[(2-methoxyphenyl)azo]-2-naphthol (CI 12150)

SOLVENT RED 1 is linked to 1 EU annex record on this page. Inventory note: II/1231.

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Regulatory evidence by market

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Market	Evidence status	Records	Source language
European Union	Evidence linked Prohibited entry found Open this evidence	1	English and EU languages
Great Britain	Source mapped Official source mapped; ingredient rule not imported	0	English
Canada	Source mapped Official source mapped; ingredient rule not imported	0	English and French
New Zealand	Source mapped Official source mapped; ingredient rule not imported	0	English
ASEAN	Source mapped Official source mapped; ingredient rule not imported	0	English and national languages
China	Source mapped Official source mapped; ingredient rule not imported	0	Chinese with selected English material
Japan	Source mapped Official source mapped; ingredient rule not imported	0	Japanese; official English translation available
South Korea	Source mapped Official source mapped; ingredient rule not imported	0	Korean with some English names
United States	Source mapped Official source mapped; ingredient rule not imported	0	English
Australia	Source mapped Official source mapped; ingredient rule not imported	0	English
Brazil	Source mapped Official source mapped; ingredient rule not imported	0	Portuguese with INCI crosswalks
India	Source mapped Official source mapped; ingredient rule not imported	0	English and Hindi
Saudi Arabia	Source mapped Official source mapped; ingredient rule not imported	0	Arabic and English

Chemical identity and properties

PubChem 2D chemical structure for CAS 1229-55-6

CAS 1229-55-6PubChem CID 14678

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 Å²
Hydrogen-bond donors: 1
Hydrogen-bond acceptors: 4
Covalent units: 1
Defined stereocentres: 0

Also known as

Sudan Red GSolvent red 1Ceres Red G1-((2-Methoxyphenyl)diazenyl)naphthalen-2-ol1-(2-Methoxyphenylazo)-2-naphtholFat Red BGFat Soluble Red SC.I. Solvent Red 1

16 more reported names

Organol VermilionResinol Red GSilotras Red TGSomalia Red PGOleal Red GFat-soluble Red SC.I. Food Red 16Plastoresin Red FRCeres Red G 1021-(o-Anisylazo)-2-naphtholC.I. Solvent Red IC.I. 121502-Naphthalenol, 1-((2-methoxyphenyl)azo)-CI 121501-((2-Methoxyphenyl)azo)-2-naphtholSolvent Red 1 (C.I.)

Open full PubChem record PubChem annotations 3D structure image

External database identifiers

ChEMBL:CHEMBL1986529
EPA DTXSID:DTXSID3061635

Evidence from additional scientific databases

NIH PubChem PUG-View

Exact identifier match14678

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.

Inventory details for SOLVENT RED 1

INCI name

SOLVENT RED 1

Description

1-[(2-methoxyphenyl)azo]-2-naphthol (CI 12150)

Record provenance

Inventory reference: 41710
Imported identity: SOLVENT RED 1
Source update: 15/10/2010

European Commission CosIng source notes

Annex records for SOLVENT RED 1

Annex II Restriction reference

Entry 1231

Solvent Red 1 (CI 12150), when used as a substance in hair dye products

CAS: 1229-55-6

EC: 214-968-9

Key data

CAS

1229-55-6

214-968-9

Restriction

II/1231

Function

HAIR DYEING: Imparting color to hair. Hair dyeing preparations may be temporary, semi-permanent, or permanent, depending on the length of time the colorant remains on the hair.

Official EU ingredient-name evidence

The ingredient name exactly matches the official 2025 EU glossary of common ingredient names.

#27210 · SOLVENT RED 1

Records sharing a CAS or EC identity

CI 12150

Ingredients with overlapping formulation functions

SOLVENT BLUE 35HAIR DYEING

SOLVENT GREEN 3HAIR DYEING

SOLVENT GREEN 7COLORANT, HAIR DYEING

SOLVENT ORANGE 1HAIR DYEING

SOLVENT RED 23HAIR DYEING

SOLVENT RED 3HAIR DYEING

SOLVENT RED 72COLORANT, HAIR DYEING

SOLVENT RED 73HAIR DYEING

Additional official and scientific sources

11 external databases to check this identity in

Each link searches that source for this identity. What each source is, and its legal weight

ECHA CHEM / Information on chemicals PubChem PUG REST EU Safety Gate cosmetic product alerts ECHA CHEM US EPA CompTox Cosmetic Ingredient Review safety assessments FDA Global Substance Registration System ILO/WHO International Chemical Safety Cards Japan NITE-CHRIP NIOSH Pocket Guide to Chemical Hazards OECD eChemPortal

How SOLVENT RED 1 appears in the CosIng inventory

The CosIng inventory lists SOLVENT RED 1 as a cosmetic ingredient and this page links it to 1 annex record. The inventory entry captures names and identifiers, while the annex record shows where the substance is prohibited, restricted or positively listed in EU cosmetics law.

SOLVENT RED 1 is also tagged with 1 cosmetic function in the official data. Function labels describe intended use, but they do not replace regulatory review of linked annex records before formulation or labelling work.

Frequently asked questions

SOLVENT RED 1 appears in the EU CosIng inventory and has linked annex records. Check the annex records above for applicable restrictions, concentration limits and conditions of use. Annex II listing means prohibited; Annex III means restricted; Annexes IV, V and VI mean permitted under specified conditions.

The restriction field for SOLVENT RED 1 reads: "II/1231". This is the restriction note recorded in the CosIng inventory for this ingredient. For authoritative conditions and limits, always refer to the linked annex entries above.

According to the EU CosIng inventory, SOLVENT RED 1 carries the following function designation(s):

HAIR DYEING

CAS 1229-55-6 may appear across multiple EU annex records. Viewing the CAS lookup page shows all Annex II–VI entries sharing this identifier, which is useful for identifying cross-annex regulatory status of the same chemical substance.

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Source note for SOLVENT RED 1

This page combines the CosIng inventory entry for SOLVENT RED 1 with 1 linked Annex II–VI record from the local dataset built from public European Commission cosmetic ingredient materials.

Use this inventory page to research SOLVENT RED 1 and compare linked records, but verify restrictions and legal status against the current official source text and law before making regulatory decisions.

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Tools & next steps

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