HC BLUE NO. 2 is graded C (Moderate) by Expert·ING, based on COSING regulatory data. It is restricted under EU COSING — AnnexIII-SAFETY-.
HC BLUE NO. 2
Safety grade: C
HC Blue No. 2 is a synthetic hair dye ingredient that creates blue color in hair. It's a small organic molecule that penetrates the hair shaft to deposit color.
This ingredient is used in hair dyes to permanently or semi-permanently color hair blue by bonding with the hair structure.
Graded using: COSING.
- EU COSING — Restricted
Last verified: May 26, 2026
Safer alternatives to HC BLUE NO. 2
- ULTRAMARINES — Grade A. Ultramarine Blue provides the same blue hair coloration as HC Blue No. 2.
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