4-Nitro-o-Phenylenediamine

AKA “2-phenylenediamine, 2-Diamino-4-nitrobenzene, 2-Amino-4-nitroaniline, 2-diaminobenzene, p-Nitro-o-phenylenediamine, 4-Diaminonitrobenzene, 2-Benzenediamine, 2-benzenediamine”

Synthetic

Ingredient Facts

4-Nitro-o-Phenylenediamine

AKA: 2-phenylenediamine, 2-Diamino-4-nitrobenzene, 2-Amino-4-nitroaniline, 2-diaminobenzene, P-Nitro-o-phenylenediamine, 4-Diaminonitrobenzene, 2-Benzenediamine, 2-benzenediamine

Synthetic · Hair Dyeing · EWG: 4

Synthetic

Safety Concern

Synthetic

Clean

A synthetic colorant that helps create long-lasting hair dyes. It works as a base ingredient in permanent color formulas to develop rich, vibrant shades.

Solubility less than 1 mg/mL at 68.9 °F (NTP, 1992)

Formula

C6H7N3O2

Mol. Weight

153.14

CAS #

99-56-9

Form

Liquid

State

4-nitro-o-phenylenediamine appears as dark red needles or red solid. (NTP, 1992)

See origin →

Functions

Hair Dyeing

Reduces Inflammation

Antioxidant Protection

Fights Bacteria

Colors Hair

Traditional Use

Synthetic azo dye developed in the early 20th century for use as a hair colorant. Part of the family of coal tar-derived compounds that revolutionized permanent hair color formulation.