AKA: Basic Yellow 13, 3-((4, 5-Dihydro-3-methyl-5-oxo-1-phenyl-1H-pyrazol-4-yl)azo)-N, N-trimethylanilinium chloride, 3-[(4, 5-dihydro-3-methyl-5-oxo-1-phenyl-1h-pyrazol-4-yl)azo]-n, N-trimethylanilinium chloride, 68391-31-1, Trimethyl-[3-[(3-methyl-5-oxo-1-phenyl-4H-pyrazol-4-yl)diazenyl]phenyl]azanium;chloride, Basic Yellow 19, Benzenaminium, 5-dihydro-3-methyl-5-oxo-1-phenyl-1H-pyrazol-4-yl)azo)-N, Chloride, 5-dihydro-3-methyl-5-oxo-1-phenyl-1H-pyrazol-4-yl)azo]-N
WHAT IS IT? Origin Basic Yellow 57 is a synthetic azo dye belonging to the imidazole chemical family used in colorant applications. It is synthesized through diazotization and coupling reactions of aromatic amines and phenolic compounds.
3-[(4,5-Dihydro-3-methyl-5-oxo-1-phenyl-1H-pyrazol-4-yl)azo]-N,N,N-trimethylanilinium chloride (CI 12719)
CAN I TRUST THIS? The paper trail
🔬 Peer-reviewed none on file
🛡️ Safety-assessed 3 reviews →
Counts, not a verdict. A listing isn't a study. The trail, you decide.
IS IT CLEAN? CIR Safety Findings
Not a Skin Irritant
3 studies / 3 not irritating (CIR 840)
Not a Sensitizer
2 studies / 2 not sensitizing (CIR 840)
Mixed Eye Irritation Results
2 studies / 1 irritating / 1 not irritating (CIR 840)
Dermal Absorption 0.01–2.3%
4 animal and lab (in vitro) studies in the CIR safety assessment (CIR 840)
Concentration Guide
0% 50% 100%
EU regulatory limit: 2% in non-oxidative hair dye products. Source: EU Cosmetics Regulation (EC) 1223/2009, Annex III (Restricted Substances), Entry 262.
Regulatory Status
JAPAN ✔ permitted
Verified Jun 2026
Data: PubChem · CosIng · EWG · CIR
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