N-Phenyl-p-Phenylenediamine HCl
AKA “4-Aminodiphenylamine hydrochloride, 4-Benzenediamine, monohydrochloride, Eucanine Grey B, Zoba Grey BR, N-Phenyl-p-phenylenediamine hydrochloride, Fourrine Grey B, p-Aminodiphenylamine HCl”
Synthetic
Ingredient Facts
N-phenyl-p-phenylenediamine hcl
AKA: 4-Aminodiphenylamine hydrochloride, 4-Benzenediamine, Monohydrochloride, Eucanine Grey B, Zoba Grey BR, N-Phenyl-p-phenylenediamine hydrochloride, Fourrine Grey B, P-Aminodiphenylamine HCl
Synthetic · Hair Dyeing · EWG: 4
Synthetic
Synthetic
Clean
A color-depositing agent that helps create and maintain vibrant, long-lasting hair dye shades. Works as a key component in professional and at-home hair coloring formulas.
Formula
C12H13ClN2
Mol. Weight
220.70
CAS #
2198-59-6, 56426-15-4
Form
Liquid
See origin →
Functions
Hair Dyeing
Boosts Collagen
Fights Acne
Colors hair
Traditional Use
Hydrochloride salt form of a synthetic hair dye intermediate created in the 20th century. Used in permanent hair color formulations for improved stability.
Skin Types
●all-skin-types
Best For
General
Melanin-Rich Skin
Suitable
Pregnancy & Breastfeeding Safe
No
Final Report on the Safety Assessment of N-Phenyl-p-Phenylenediamine, N-Phenyl-p-Phenylenediamine Hydrochloride, and N-Phenyl-p-Phenylenediamine Sulfate
Cosmetic Ingredient Review (CIR) Expert Panel
International Journal of Toxicology
N-Phenyl-p-Phenylenediamine HCl
European Commission
EU Cosmetic Ingredient Database (CosIng)
Safety and efficacy of l-histidine monohydrochloride monohydrate produced using Corynebacterium glutamicum KCCM 80179 for all animal species.
EFSA Panel on Additives and Products or Substances used in Animal Feed (FEEDAP), Bampidis V, Azimonti G, de Lourdes Bastos M, Christensen H et al.
EFSA journal. European Food Safety Authority, 2019
Safety and efficacy of l-lysine monohydrochloride and concentrated liquid l-lysine (base) produced by fermentation with Corynebacterium glutamicum KCC
EFSA Panel on Additives and Products or Substances used in Animal Feed (FEEDAP), Bampidis V, Azimonti G, Bastos ML, Christensen H et al.
EFSA journal. European Food Safety Authority, 2020
Verified Feb 2026
Data: PubChem · CosIng · EWG · CIR