4-Amino-3-Nitrophenol
molecular structure · PubChem
AKA: 610-81-1, 3-Nitro-4-aminophenol, 2-Nitro-4-hydroxyaniline, 2-amino-5-hydroxynitrobenzene
Synthetic
Not Clean
4-amino-3-nitrophenol
Formula
C6H6N2O3
Mol. Weight
154.12
CAS #
610-81-1
Form
Powder
Functions
Hair Dyeing
Locks In Moisture
Reduces Inflammation
Colors Hair
Traditional Use
A synthetic hair dye precursor developed in the early-to-mid 20th century. Used in permanent hair color formulations to create brown and black shades.
EWG
5
CIR
Safe as used
Pregnancy
No
CIR Safety Findings
ewg-5
medical-approval
all-shades-safe
Concentration Guide
1.0%
0%1%
Reg. Limit
EU regulatory limit: 1.0%. (a) and (b) “ Hair colourants can cause severe allergic reactions. Read and follow instructions. This product is not intended for use on persons under the age of 16. Temporary ‘black henna’ tattoos m... Source: EU Cosmetics Regulation (EC) 1223/2009, Annex III (Restricted Substances), Entry 215
Regulatory Agencies
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
Data: PubChem · CosIng · EWG · CIR