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CAS 6407-78-9 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.

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InventoryRef 5822715/10/2010

SOLVENT YELLOW 18

CI 12740

SOLVENT YELLOW 18 is listed in the EU CosIng inventory, but no direct annex records are linked on this page yet.

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Regulatory evidence by market

No rule for this ingredient has been imported for any of the 13 markets tracked here.

That describes this inventory, not the law. No imported rule is not evidence that an ingredient is permitted: a rule may exist under another name or identifier, or in a dataset not yet imported here.

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Chemical identity and properties

PubChem 2D chemical structure for CAS 6407-78-9

CAS 6407-78-9PubChem CID 110846

Solvent Yellow 18

IUPAC name: 4-[(2,4-dimethylphenyl)diazenyl]-5-methyl-2-phenyl-4H-pyrazol-3-one

Molecular formula: C18H18N4O
Molecular weight: 306.4 g/mol
Exact mass: 306.14806121 Da
XLogP3: 4.0
Topological polar surface area: 57.4 Å²
Hydrogen-bond donors: 0
Hydrogen-bond acceptors: 4
Covalent units: 1
Defined stereocentres: 0

Also known as

C.I. Solvent yellow 184-[(2,4-dimethylphenyl)azo]-2,4-dihydro-5-methyl-2-phenyl-3h-pyrazol-3-oneUNII-L4SQI4K87SEINECS 229-043-54-((2,4-Dimethylphenyl)azo)-2,4-dihydro-5-methyl-2-phenyl-3H-pyrazol-3-oneL4SQI4K87S3H-Pyrazol-3-one, 4-(2-(2,4-dimethylphenyl)diazenyl)-2,4-dihydro-5-methyl-2-phenyl-3H-Pyrazol-3-one, 4-[2-(2,4-dimethylphenyl)diazenyl]-2,4-dihydro-5-methyl-2-phenyl-

13 more reported names

RefChem:184255Solvent Yellow 18 [INCI]C.I. FOOD YELLOW 12CI 127403H-Pyrazol-3-one, 4-((2,4-dimethylphenyl)azo)-2,4-dihydro-5-methyl-2-phenyl-3H-Pyrazol-3-one, 4-[(2,4-dimethylphenyl)azo]-2,4-dihydro-5-methyl-2-phenyl-4-[(2,4-dimethylphenyl)diazenyl]-5-methyl-2-phenyl-2,4-dihydro-3H-pyrazol-3-one4-((2,4-Dimethylphenyl)diazenyl)-5-methyl-2-phenyl-2,4-dihydro-3H-pyrazol-3-oneKLQVCADYSBUVAV-UHFFFAOYSA-NHY-D0421CS-0010472AG-690/365370634-(2,4-dimethylphenyl)azo-5-methyl-2-phenyl-4H-pyrazol-3-one

Open full PubChem record PubChem annotations 3D structure image

External database identifiers

EPA DTXSID:DTXSID10863784

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 YELLOW 18

INCI name

SOLVENT YELLOW 18

Description

CI 12740

Record provenance

Inventory reference: 58227
Imported identity: SOLVENT YELLOW 18
Source update: 15/10/2010

European Commission CosIng source notes

Annex records for SOLVENT YELLOW 18

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Key data

CAS

6407-78-9

229-043-5

Restriction

—

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.

#27220 · SOLVENT YELLOW 18

Ingredients with overlapping formulation functions

SOLVENT RED 72COLORANT, HAIR DYEING

SOLVENT RED 73HAIR DYEING

SOLVENT VIOLET 13HAIR DYEING

SOLVENT YELLOW 172HAIR DYEING

SOLVENT YELLOW 29HAIR DYEING

SOLVENT YELLOW 33HAIR DYEING

SOLVENT YELLOW 44HAIR DYEING

SOLVENT YELLOW 85HAIR 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 YELLOW 18 appears in the CosIng inventory

The CosIng inventory lists SOLVENT YELLOW 18 as a cosmetic ingredient and this page links it to 0 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 YELLOW 18 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 YELLOW 18 is listed in the EU CosIng ingredient inventory with no direct annex restriction records linked at this time. Absence of an annex link does not guarantee unrestricted use — always verify against the current official CosIng database before formulating.

According to the EU CosIng inventory, SOLVENT YELLOW 18 carries the following function designation(s):

HAIR DYEING

CAS 6407-78-9 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 YELLOW 18

This page reproduces the CosIng inventory entry for SOLVENT YELLOW 18 from public European Commission cosmetic ingredient materials and shows linked identifiers even when no direct annex match is currently attached.

Use this inventory page to research SOLVENT YELLOW 18 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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