HC Red No. 1
AKA “2-Nitro-4-aminodiphenylamine, 2784-89-6, 1, 4-Benzenediamine, 2-nitro-N1-phenyl-, 4-Amino-2-nitrodiphenylamine, 2-Nitro-N-phenylbenzene-1, 4-diamine, 2-Nitro-N1-phenyl-1, 4-benzenediamine, EINECS 220-494-3, 1FZM1701IS, 2-nitro-4-amino-n-phenylaniline
Ingredient
Ingredient Facts
Hc red no. 1
AKA: 2-Nitro-4-aminodiphenylamine, 2784-89-6, 4-Benzenediamine, 2-nitro-N1-phenyl-, 4-Amino-2-nitrodiphenylamine, 2-Nitro-N-phenylbenzene-1, 4-diamine, 2-Nitro-N1-phenyl-1, 4-benzenediamine, EINECS 220-494-3, 1FZM1701IS, 2-nitro-4-amino-n-phenylaniline
Ingredient · Hair Dyeing · EWG: 4
Synthetic
Not Clean
2-Nitro-N1-phenylbenzene-1,4-diamine
Formula
C12H11N3O2
Mol. Weight
229.23
CAS #
2784-89-6
Form
Powder
See origin →
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.
Skin Types
all-skin-types
Best For
General
Pregnancy & Breastfeeding Safe
Caution
EWG
4
CIR
Safe as used
Pregnancy
Caution
CIR Safety Findings
medical-approval
all-shades-safe
Phototoxicity Concern
Regulatory Status
USApermitted
EUpermitted
JAPANpermitted
CANADApermitted
Verified Jun 2026
Data: PubChem · CosIng · EWG · CIR