AKA “4-Hydroxy-3-nitroaniline, Phenol, Fourrine 57, Fourrine Brown PR, 2-Nitro-4-aminophenol, Oxidation Base 25, 3-Nitro-4-hydroxyaniline, Fourrine Brown Propyl”
Synthetic
Ingredient Facts
4-Amino-2-Nitrophenol
AKA: 4-Hydroxy-3-nitroaniline, Fourrine 57, Fourrine Brown PR, 2-Nitro-4-aminophenol, Oxidation Base 25, 3-Nitro-4-hydroxyaniline, Fourrine Brown Propyl
Synthetic · Hair Dyeing · EWG: 3
Synthetic
Synthetic
Clean
A synthetic color compound used in permanent hair dyes to create rich, long-lasting color on hair.
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.
See origin →
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.