Ingredient
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CI 11920

✓ EU Allowed

Identification

CAS Number 2051-85-6
EINECS / EC 218-131-9
CosIng Ref 38152
Chemical Name 4-(phenylazo)resorcinol,
Formula C12H10N2O2
Mol. Weight 214.22 g/mol

Function & Classification

Primary Function Cosmetic Colorant
Origin Synthetic

EU Regulatory Status

🇪🇺
✓ Allowed — EU Reg. 1223/2009 II/1343 (Solvent Orange 1; CI 11920: and its salts when used as a substance in hair dye products)

Safety Profile

No toxicology data available yet for this ingredient.

Check SCCS opinions or CIR reports for published safety assessments.

NOAEL · Dermal Absorption % · Sensitization

Formulation Guidelines

Usage level, pH range, solubility and addition phase not yet available.

Usage Level % · Addition Phase · Solubility

Suppliers & Documents

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Documents

External Resources

INCIDecoder → EU CosIng →