N-Phenyl-p-Phenylenediamine

AKA: 4-Aminodiphenylamine, 101-54-2, P-AMINODIPHENYLAMINE, P-Anilinoaniline, Variamine Blue RT, Azosalt R, Luxan Black R, P-Semidine, N-Phenyl-1, 4-phenylenediamine
Allergen Warning
⚠️ PPD (Hair Dye)
Synthetic
Not Clean
N-(4-Aminophenyl)aniline (CI 76085)
Solubility less than 1 mg/mL at 66 °F (NTP, 1992)
Formula
C12H12N2
Mol. Weight
184.24
CAS #
101-54-2
Form
Liquid
State
N-phenyl-p-phenylenediamine appears as odorless purple-black solid or flake or dark purple chips. (NTP, 1992)
Functions
Hair Dyeing
Boosts Collagen
Fights Acne
Colors hair
Traditional Use
Synthetic organic compound developed in the 20th century as a permanent hair dye component. Used to create dark hair colors by oxidative coupling with other dye intermediates.
EWG
10
CIR
Safe as used
Pregnancy
No
CIR Safety Findings
medical-approval
all-shades-safe
Regulatory Status
USApermitted
EUpermitted
JAPANpermitted
CANADApermitted
🧂Conflict of interest.
Skin Types
all-skin-types
Best For
General
Pregnancy & Breastfeeding Safe
No
The paper trail
🔬Peer-reviewed1 paper
⚖️Regulatory1 listing
🛡️Safety-assessed2 reviews
Counts, not a verdict. A listing isn't a study. The trail, you decide.
Verified Jun 2026 · 🧪 = conflict
Data: PubChem · CosIng · EWG · CIR