HC Red No. 1

HC Red No. 1 molecular structure
molecular structure · PubChem
AKA: 2-Nitro-4-aminodiphenylamine, 2784-89-6, 4-Benzenediamine, 4-Amino-2-nitrodiphenylamine, 2-Nitro-N-phenylbenzene-1, 4-diamine, 2-Nitro-N1-phenyl-1, 4-benzenediamine, 2-nitro-4-amino-n-phenylaniline
Synthetic
Not Clean
2-Nitro-N1-phenylbenzene-1,4-diamine
Formula
C12H11N3O2
Mol. Weight
229.23
CAS #
2784-89-6
Form
Powder
Functions
Hair Dyeing
Colors Hair
Traditional Use
A synthetic aromatic dye created for hair coloring applications in the mid-20th century. It was developed to provide reliable red coloring in semi-permanent hair color formulations.
EWG
4
CIR
Safe as used
Pregnancy
Caution
CIR Safety Findings
medical-approval
all-shades-safe
Phototoxicity Concern
Regulatory Status
USA✔ permitted
EU✔ permitted
JAPAN✔ permitted
CANADA✔ permitted
Skin Types
●all-skin-types
Best For
General
Pregnancy & Breastfeeding Safe
Caution
The paper trail
🔬Peer-reviewed1 paper →
⚖️Regulatory0 listings
🛡️Safety-assessed1 review →
Counts, not a verdict. A listing isn't a study. The trail, you decide.
Verified Jun 2026
Data: PubChem · CosIng · EWG · CIR