HYDROXYPROPYL-P-PHENYLENEDIAMINE HCL is graded A (Safe) by Expert·ING, based on COSING regulatory data.

HYDROXYPROPYL-P-PHENYLENEDIAMINE HCL

Safety grade: A

This chemical compound is commonly used in hair dyes and colorants to help create and stabilize color. It works by reacting with other dye ingredients to produce the final hair color you see. It's a synthetic ingredient created in laboratories rather than derived from nature.

Graded using: COSING.

Last verified: June 9, 2026