ACID BLUE 9 AMMONIUM SALT is graded C (Moderate) by Expert·ING, based on COSING regulatory data. It is restricted under EU COSING — AnnexIII-SAFETY-.
ACID BLUE 9 AMMONIUM SALT
Safety grade: C
This is a synthetic blue dye commonly used in hair coloring products and cosmetics to add vibrant blue color. It's a lab-created ingredient that dissolves easily in water-based formulas.
This ingredient acts as a colorant to provide blue pigmentation in hair dyes and cosmetic products, allowing for custom color creation and shade variation.
Graded using: COSING.
- EU COSING — Restricted
Last verified: May 26, 2026
Safer alternatives to ACID BLUE 9 AMMONIUM SALT
- CI 42090 — Grade A. FDA-approved blue colorant with identical hue and soluble salt form.
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