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InventoryRef 3815413/08/2020

SOLVENT RED 3

4-[(4-Ethoxyphenyl)azo]naphthol (CI 12010)

SOLVENT RED 3 is linked to 2 EU annex records on this page. Inventory note: II/1344 (Solvent Red 3; CI 12010: and its salts when used as a substance in hair dye products).

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Regulatory evidence by market

This matrix separates verified ingredient rules from sources that are mapped but not yet imported. No imported rule does not mean the ingredient is permitted.

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MarketEvidence statusRecordsSource language
European UnionEvidence linked
Prohibited entry found
Open this evidence		2English and EU languages
Great BritainSource mapped
Official source mapped; ingredient rule not imported
0English
CanadaSource mapped
Official source mapped; ingredient rule not imported
0English and French
New ZealandSource mapped
Official source mapped; ingredient rule not imported
0English
ASEANSource mapped
Official source mapped; ingredient rule not imported
0English and national languages
ChinaSource mapped
Official source mapped; ingredient rule not imported
0Chinese with selected English material
JapanSource mapped
Official source mapped; ingredient rule not imported
0Japanese; official English translation available
South KoreaSource mapped
Official source mapped; ingredient rule not imported
0Korean with some English names
United StatesSource mapped
Official source mapped; ingredient rule not imported
0English
AustraliaSource mapped
Official source mapped; ingredient rule not imported
0English
BrazilSource mapped
Official source mapped; ingredient rule not imported
0Portuguese with INCI crosswalks
IndiaSource mapped
Official source mapped; ingredient rule not imported
0English and Hindi
Saudi ArabiaSource mapped
Official source mapped; ingredient rule not imported
0Arabic and English

Chemical identity and properties

PubChem 2D chemical structure for CAS 6535-42-8
CAS 6535-42-8PubChem CID 81021

1-Naphthalenol, 4-[(4-ethoxyphenyl)azo]-

IUPAC name
4-[(4-ethoxyphenyl)diazenyl]naphthalen-1-ol
Molecular formula
C18H16N2O2
Molecular weight
292.3 g/mol
Exact mass
292.121177757 Da
XLogP3
4.9
Topological polar surface area
54.2 Ų
Hydrogen-bond donors
1
Hydrogen-bond acceptors
4
Covalent units
1
Defined stereocentres
0

Also known as

Solvent red 3Fat Brown BC.I. Solvent Red 3CI 120101-Naphthalenol, 4-((4-ethoxyphenyl)azo)-4-((4-Ethoxyphenyl)diazenyl)naphthalen-1-olXNW2E182071-Naphthalenol, 4-(2-(4-ethoxyphenyl)diazenyl)-
13 more reported names
4-[(1E)-2-(4-ethoxyphenyl)diazen-1-yl]naphthalen-1-olUNII-XNW2E18207EINECS 229-439-8CERES BROWN B4-((4-Ethoxyphenyl)azo)-1-naphthalenolFat brown b, technical gradeMSK58904-((4-Ethoxyphenyl)azo)naphtholJSEYDVLGSMLKDL-UHFFFAOYSA-NBRUN FONCE AU GRAS W 82014-[(4-ethoxyphenyl)diazenyl]-alpha-naphthol4-((4-ETHOXYPHENYL)AZO)-1-NAPHTHOL(4E)-4-[(4-ethoxyphenyl)hydrazono]naphthalen-1-one
Open full PubChem recordPubChem annotations3D structure image
External database identifiers

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 3

INCI name

SOLVENT RED 3

Description

4-[(4-Ethoxyphenyl)azo]naphthol (CI 12010)

Record provenance

Inventory reference
38154
Imported identity
SOLVENT RED 3
Source update
13/08/2020
European Commission CosIng source notes
Annex IV Identified ingredient
Entry 8

CI 12010

CAS: 6535-42-8
EC: 229-439-8

Key data

CAS
6535-42-8
EC
229-439-8
Restriction
II/1344 (Solvent Red 3; CI 12010: and its salts when used as a substance in hair dye products)
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.

#27213 · SOLVENT RED 3

Records sharing a CAS or EC identity

CI 12010

Ingredients with overlapping formulation functions

SOLVENT GREEN 7COLORANT, HAIR DYEING
SOLVENT ORANGE 1HAIR DYEING
SOLVENT RED 1HAIR DYEING
SOLVENT RED 23HAIR DYEING
SOLVENT RED 72COLORANT, HAIR DYEING
SOLVENT RED 73HAIR DYEING
SOLVENT VIOLET 13HAIR DYEING
SOLVENT YELLOW 172HAIR 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 chemicalsPubChem PUG RESTEU Safety Gate cosmetic product alertsECHA CHEMUS EPA CompToxCosmetic Ingredient Review safety assessmentsFDA Global Substance Registration SystemILO/WHO International Chemical Safety CardsJapan NITE-CHRIPNIOSH Pocket Guide to Chemical HazardsOECD eChemPortal

How SOLVENT RED 3 appears in the CosIng inventory

The CosIng inventory lists SOLVENT RED 3 as a cosmetic ingredient and this page links it to 2 annex records. The inventory entry captures names and identifiers, while the annex records show where the substance is prohibited, restricted or positively listed in EU cosmetics law.

SOLVENT RED 3 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 3 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 3 reads: "II/1344 (Solvent Red 3; CI 12010: and its salts when used as a substance in hair dye products)". 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 3 carries the following function designation(s):

CAS 6535-42-8 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 3

This page combines the CosIng inventory entry for SOLVENT RED 3 with 2 linked Annex II–VI records from the local dataset built from public European Commission cosmetic ingredient materials.

Use this inventory page to research SOLVENT RED 3 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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