ACID BLUE 1 is graded A (Safe) by Expert·ING, based on EU COSING Annex IV regulatory data.

ACID BLUE 1

Ammonium, (4-(alpha-(p-(diethylamino)phenyl)-2,4-disulfobenzylidene)-2,5-cyclohexadien-1-ylidene)diethyl-, hydroxide, monosodium salt

Safety grade: A

This colorant is permitted in EU cosmetics but restricted to certain product types or conditions of use under EU Cosmetics Regulation (EC) No 1223/2009. To be sold legally in the EU or UK, a product must meet these conditions.

Graded using: EU COSING Annex IV.

• EU COSING — Permitted

Last verified: June 9, 2026