4-NITRO-O-PHENYLENEDIAMINE DIHYDROCHLORIDE is graded A (Safe) by Expert·ING, based on COSING regulatory data.
4-NITRO-O-PHENYLENEDIAMINE DIHYDROCHLORIDE
Safety grade: A
This is a synthetic chemical compound used as a coloring agent in hair dye products. It helps create specific shades, particularly orange and red tones, when applied to hair.
It is used in hair dye formulations to deposit color onto the hair shaft, providing long-lasting pigmentation and contributing to a desired hair color result.
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