CI 42090/Blue 2 ●
TL;DR. This ingredient is a cosmetic colorant that provides a blue hue or adjusts the shade of aqueous formulas such as cleansers, gels, lotions, and oral-care products. It does not primarily cleanse, moisturize, preserve, or emulsify.
What does CI 42090/Blue 2 do in a cosmetic formula?
This ingredient is a cosmetic colorant that provides a blue hue or adjusts the shade of aqueous formulas such as cleansers, gels, lotions, and oral-care products. It does not primarily cleanse, moisturize, preserve, or emulsify.
Is CI 42090/Blue 2 clean?
This ingredient is a synthetic colorant, and many clean-beauty programs either exclude or tightly limit this dye class because of petroleum-derived manufacturing and trace impurity controls. It is used at very low levels, but the label pairing provided is internally inconsistent, so exact compliance should be checked against supplier documentation and the market of sale.
Is CI 42090/Blue 2 sustainable?
This material is typically made from petrochemical aromatic feedstocks and is not a renewable-origin colorant. It is water-soluble and may be slow to biodegrade, so wastewater controls in dye production and product manufacturing matter.
Is CI 42090/Blue 2 COSMOS-approved?
This ingredient is not permitted for COSMOS natural or organic certification because synthetic organic colorants are outside the allowed colorant set. Its Green Chemistry profile is weak due to nonrenewable feedstocks and limited biodegradability, even though use levels are very low.
How does CI 42090/Blue 2 work chemically?
If the color index number is the controlling identifier, the molecule is an anionic, sulfonated synthetic dye with high water solubility and strong tinting strength. Typical cosmetic use is in trace amounts, often far below 0.1%, and performance depends on pH, light exposure, oxidizing or reducing agents, and compatibility with cationic ingredients.
Last updated 2026-08-29