Blue 1/Ci 42090 ●
TL;DR. This ingredient is a water-soluble colorant used to give products a bright it shade or to tune the final color of a formula. It has no primary skin-care benefit and is used for appearance and product identification.
What does Blue 1/Ci 42090 do in a cosmetic formula?
This ingredient is a water-soluble colorant used to give products a bright it shade or to tune the final color of a formula. It has no primary skin-care benefit and is used for appearance and product identification.
Is Blue 1/Ci 42090 clean?
Clean-beauty programs often flag it as a synthetic colorant, even though it is a regulated color additive with defined purity specifications. The main clean-standard friction is its synthetic origin and possible trace impurity controls, not routine skin irritation at typical use levels.
Is Blue 1/Ci 42090 sustainable?
This material is typically made through petrochemical-derived synthetic dye chemistry. It is water soluble and used at very low levels, but synthetic dyes in this class are not strong fits for biodegradability or low-persistence goals.
Is Blue 1/Ci 42090 COSMOS-approved?
It is not permitted under COSMOS natural or organic standards because it is a synthetic organic colorant rather than an approved mineral pigment or nature-derived color. From a Green Chemistry perspective, it has weak alignment because it relies on nonrenewable feedstocks and does not offer a strong biodegradability profile.
How does Blue 1/Ci 42090 work chemically?
The molecule is an anionic, sulfonated triarylmethane dye, which explains its high water solubility and strong tinting strength. Use levels are usually very low, often in the ppm range to well below 0.1%, and it is generally stable in water-based formulas but can shift or fade with strong oxidizers, reducers, or incompatible charged ingredients.
Last updated 2026-05-13