BASIC BLUE 99 is graded A (Safe) by Expert·ING, based on COSING regulatory data.
BASIC BLUE 99
Safety grade: A
Basic Blue 99 is a synthetic blue dye commonly used in hair coloring products. It's a chemical colorant that bonds to hair strands to create or enhance blue tones.
This ingredient is used in hair dyes to impart blue color to hair by penetrating and coating the hair shaft with pigment.
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