What does the restriction note for SOLVENT RED 24 mean?

The restriction field for SOLVENT RED 24 reads: II/379. 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 85-83-6?

CAS 85-83-6 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 24?

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 8460715/10/2010

SOLVENT RED 24

2',3-Dimethyl-4-(2-Hydroxynaphthylazo) Azobenzene

SOLVENT RED 24 is linked to 1 EU annex record on this page. Inventory note: II/379.

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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	Evidence linked Prohibited Open this evidence	1	English
Canada	Evidence linked Prohibited Open this evidence	1	English and French
New Zealand	Evidence linked Prohibited Open this evidence	1	English
ASEAN	Evidence linked Prohibited Open this evidence	1	English and national languages
China	Evidence linked Prohibited Open this evidence	1	Chinese with selected English material
Japan	Source mapped Official source mapped; ingredient rule not imported	0	Japanese; official English translation available
South Korea	Evidence linked Prohibited Open this evidence	1	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	Evidence linked Prohibited Open this evidence	1	Portuguese with INCI crosswalks
India	Evidence linked Prohibited Open this evidence	1	English and Hindi
Saudi Arabia	Evidence linked Prohibited Open this evidence	1	Arabic and English

Chemical identity and properties

PubChem 2D chemical structure for CAS 85-83-6

CAS 85-83-6PubChem CID 62330

Sudan IV

Sudan IV is a bis(azo) compound that is 2-naphthol substituted at position 1 by a {2-methyl-4-[(2-methylphenyl)diazenyl]phenyl}diazenyl group. A fat-soluble dye predominantly used for demonstrating triglycerides in frozen sections, but which may also stain some protein bound lipids in paraffin sections. It has a role as a carcinogenic agent, a fluorochrome and a histological dye. It is a member of azobenzenes, a member of naphthols and a bis(azo) compound. It is functionally related to a 2-naphthol. — ChEBI

IUPAC name: 1-[[2-methyl-4-[(2-methylphenyl)diazenyl]phenyl]diazenyl]naphthalen-2-ol

Molecular formula: C24H20N4O
Molecular weight: 380.4 g/mol
Exact mass: 380.16371127 Da
XLogP3: 7.1
Topological polar surface area: 69.7 Å²
Hydrogen-bond donors: 1
Hydrogen-bond acceptors: 5
Covalent units: 1
Defined stereocentres: 0

Also known as

Scarlet redSolvent red 24C.I. Solvent Red 24Lipid crimsonScharlachrotWaxoline Red OMFat Ponceau RLacquer Red VS

16 more reported names

Ceres Red BBResinol Red 2BGrasal Brilliant Red BFat Red 2BResoform Red GWaxoline Red OWaxoline Red OSCandle Scarlet BCandle Scarlet GLacquer Red VOrganol Red BRubrum scarlatinumTertrogras Red NSomalia Red IVSudan PWaxakol Red BL

Open full PubChem record PubChem annotations 3D structure image

External database identifiers

ChEBI:CHEBI:88014
ChEMBL:CHEMBL1707454
ChEMBL:CHEMBL4303605
EPA DTXSID:DTXSID8041743
PubMed:9842

Retrieved from NIH PubChem on 2026-08-31 by checksum-valid CAS matching. Chemical properties do not replace the regulatory decision on this page.

Inventory details for SOLVENT RED 24

INCI name

SOLVENT RED 24

Description

2',3-Dimethyl-4-(2-Hydroxynaphthylazo) Azobenzene

Record provenance

Inventory reference: 84607
Imported identity: SOLVENT RED 24
Source update: 15/10/2010

European Commission CosIng source notes

Annex records for SOLVENT RED 24

Annex II Restriction reference

Entry 379

Colouring agent CI 26105 (Solvent Red 24)

CAS: 85-83-6

EC: 201-635-8

Key data

CAS

85-83-6

201-635-8

Restriction

II/379

Function

COLORANT: Exclusively or mainly intended to colour the cosmetic product, the body as a whole or certain parts thereof, by absorption or reflection of visible light. All authorised colorants are substances in the positive list of Annex IV to the Cosmetics Regulation 1223/2009.

Official EU ingredient-name evidence

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

#27212 · SOLVENT RED 24

Ingredients with overlapping formulation functions

SODIUM 5-NITROGUAIACOLATECOLORANT

SODIUM HYALURONATE FERULATECOLORANT, SKIN CONDITIONING, SKIN CONDITIONING - EMOLLIENT, SKIN PROTECTING

SOLANUM LYCOPERSICUM POMACE POWDERANTIOXIDANT; COLORANT; EXFOLIATING

SOLVENT GREEN 7COLORANT, HAIR DYEING

SOLVENT RED 48COLORANT

SOLVENT RED 49:1COLORANT

SOLVENT RED 72COLORANT, HAIR DYEING

SPHINGOMONAS OLEI EXTRACT FILTRATECOLORANT

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 24 appears in the CosIng inventory

The CosIng inventory lists SOLVENT RED 24 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 24 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 24 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 24 reads: "II/379". 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 24 carries the following function designation(s):

COLORANT

CAS 85-83-6 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 24

This page combines the CosIng inventory entry for SOLVENT RED 24 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 24 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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