DIRECT BLACK 51
⚠ EU RestrictedIdentification
CAS Number 3442-21-5
EINECS / EC 222-351-0
CosIng Ref 33564
Chemical Name disodium;6-amino-3-[[4-[(3-carboxy-4-hydroxyphenyl)diazenyl]naphthalen-1-yl]diazenyl]-4-oxidonaphthalene-2-sulfonate
IUPAC Name —
Formula C27H17N5Na2O7S
Mol. Weight 601.5 g/mol
SMILES C1=CC=C2C(=C1)C(=CC=C2N=NC3=C(C=C4C=CC(=CC4=C3[O-])N)S(=O)(=O)[O-])N=NC5=CC(=C(C=C5)O)C(=O)O.[Na+].[Na+]
InChIKey DSCVOQXQGTYXMV-UHFFFAOYSA-L
Function & Classification
Primary Function HAIR DYEING
EU Regulatory Status
Safety Profile
No toxicology data available yet for this ingredient.
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NOAEL · Dermal Absorption % · Sensitization
Formulation Guidelines
Usage level, pH range, solubility and addition phase not yet available.
Usage Level % · Addition Phase · Solubility
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