NITROPHENOL is graded A (Safe) by Expert·ING, based on COSING regulatory data.
NITROPHENOL
Safety grade: A
Nitrophenol is a chemical compound used in hair coloring products to help develop and fix hair dye colors. It works as an oxidizing agent that activates hair dye formulations to penetrate and permanently color hair strands.
This ingredient serves as an oxidizing agent in hair dye formulations, enabling the chemical reactions necessary to develop color and ensure long-lasting hair color results.
Graded using: COSING.
Last verified: May 26, 2026
Other Hair Dyeing ingredients
- RESORCINOL — Grade E**
- THYMOL — Grade A
- M-AMINOPHENOL — Grade C**
- P-AMINOPHENOL — Grade C**
- 2-METHYLRESORCINOL — Grade C
- 4-AMINO-2-HYDROXYTOLUENE — Grade C
- P-PHENYLENEDIAMINE — Grade D**
- 2-METHYL-5-HYDROXYETHYLAMINOPHENOL — Grade C