4-Amino-2-Nitrophenol
molecular structure · PubChem
AKA: 119-34-6, 4-Hydroxy-3-nitroaniline, Fourrine 57, Fourrine Brown PR, 2-Nitro-4-aminophenol, Oxidation Base 25, 3-Nitro-4-hydroxyaniline, Fourrine Brown Propyl
Synthetic
Not Clean
Based on the data contained in this report, the CIR Expert Panel concludes that 2-amino-3-nitrophenol, 2-amino-4-nitrophenol,2-amino-4-nitrophenol sulfate, 2-amino-5-nitrophenol, 4-amino-3-nitrophenol, 3-nitro-p-hydroxyethylaminophenol, and 4-hydroxypropylamino-3-nitrophenol are safe as hair dye ingredients in the practices of use and concentration as described in this safety assessment, but the data are insufficient to make a determination of safety for 4-amino-2-nitrophenol.
Solubility less than 0.1 mg/mL at 70 °F (NTP, 1992)
Formula
C6H6N2O3
Mol. Weight
154.12
CAS #
119-34-6
Form
Powder
State
4-amino-2-nitrophenol appears as dark red plates, needles or reddish-purple powder. Melting point 125-127 °C.
Functions
Hair Dyeing
Antioxidant Protection
Reduces Inflammation
Fights Bacteria
Colors Hair
Traditional Use
A synthetic hair dye ingredient developed in the early 20th century. One of the foundational chemicals in modern permanent hair coloring technology.
Skin Types
●all-skin-types
Best For
General
Pregnancy & Breastfeeding Safe
No
The paper trail
🔬Peer-reviewed1 paper →
⚖️Regulatory0 listings
🛡️Safety-assessed1 review →
Counts, not a verdict. A listing isn't a study. The trail, you decide.
Verified Jun 2026
Data: PubChem · CosIng · EWG · CIR