CI 42051
Adds color.
In the Added colorants group
What it is
A lab-made blue dye from the triphenylmethane family of colors.
Gives the product a blue color.
What it does in a formula
Adds colorOfficial EU function: Colorant
Why some people watch for it
Added colorants
Some people prefer products without added color.
What official sources say
Restricted in certain uses · Cosmetics, EU
Allowed as a colorant in EU cosmetics with conditions (Annex IV).
Regulation (EC) No 1223/2009, Annex IV: list of colorants allowed in cosmetic products, retrieved 2026-10-09Restricted in certain uses · Cosmetics, EU
EU cosmetics law bans it only in some forms or uses (Annex II, entry 1356).
Regulation (EC) No 1223/2009, Annex II: list of substances prohibited in cosmetic products, retrieved 2026-10-09