4-NITRO-O-PHENYLENEDIAMINE SULFATE is graded A (Safe) by Expert·ING, based on COSING regulatory data.
4-NITRO-O-PHENYLENEDIAMINE SULFATE
Safety grade: A
This is a synthetic chemical compound used as a coloring agent in hair dye products. It helps create and fix color in the hair shaft to achieve a desired shade.
It is used in hair dyeing products to provide long-lasting color by penetrating the hair shaft and forming stable color molecules.
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