N-Phenyl-p-Phenylenediamine Sulfate
AKA “p-Aminodiphenylamine sulfate, 4-Benzenediamine, sulfate (2:1), RODOL GRAY BS, COLOREX 4ADS, N-Phenyl-1, 4-benzenediamine sulfate”
Synthetic
Ingredient Facts
N-phenyl-p-phenylenediamine sulfate
AKA: P-Aminodiphenylamine sulfate, 4-Benzenediamine, Sulfate (2:1), RODOL GRAY BS, COLOREX 4ADS, N-Phenyl-1, 4-benzenediamine sulfate
Synthetic · Hair Dyeing · EWG: 4
Synthetic
Synthetic
Clean
A color-depositing agent that helps create and maintain vibrant, long-lasting hair color. Works to ensure even, consistent dye coverage throughout your hair.
Formula
C24H26N4O4S
Mol. Weight
466.60
CAS #
4698-29-7
Form
Powder
See origin →
Functions
Hair Dyeing
Boosts Collagen
Fights Acne
Colors hair
Traditional Use
Sulfate salt of a synthetic hair dye precursor created for cosmetic use in the 20th century. Functions as an oxidative dye intermediate in permanent hair color products.
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 Sulfate
European Commission
EU Cosmetic Ingredient Database (CosIng)
N-Phenyl-p-Phenylenediamine Sulfate
Environmental Working Group (EWG)
EWG Skin Deep Cosmetics Database
Verified Feb 2026
Data: PubChem · CosIng · EWG · CIR