CI 42090 is a synthetic color additive, also known as Brilliant Blue FCF or FD&C Blue No. 1, used to impart a blue color to products.

Is CI 42090 safe for use on skin?

CI 42090 is generally considered safe for topical use in cosmetics within regulatory limits, though some individuals may experience mild irritation or allergic reactions.

Home › Ingredients › CI 42090

CI 42090

Also known as: FD&C Blue No. 1, Brilliant Blue FCF, Acid Blue 9

CI 42090 is a synthetic blue dye commonly used in cosmetics, personal care products, and food. It provides a vibrant blue color to formulations. This ingredient is regulated for purity and concentration to ensure its safe use in various applications.

ColorantVegan

BenefitNone 0 / 4

RiskLow 1 / 4

Sensitization i0.5 / 4

Risk of allergic contact dermatitis or immune-based reactions. Fragrance allergens, preservatives, botanicals, and some dyes may score here.

Irritation i0.5 / 4

Risk of short-term irritation — stinging, burning, dryness, redness, or discomfort. Common for strong actives, acids, retinoids, fragrances, and harsh surfactants.

Rated by SpottyLabs' ingredient methodology, independent of brands.

Things to watch

Potential for skin irritation
Possible allergic reactions

See how this matches your skin

Find out exactly what you put onto your skin. Scan any product before you buy. Free and independent — no brand is paying us. Available on Android and iOS.

QR code linking to the SpottyLabs app on Google Play

QR code linking to the SpottyLabs app on the App Store

Products with CI 42090

Head & Shoulders

Classic Clean Anti-Dandruff Shampoo & Conditioner 2-in-1

4.2/ 52/8/6

Garnier

Hyaluron Fresh & Plump Hydrating Sorbet Cream

3.9/ 57/8/6

L'Oréal Paris

Lumi Le Glass Highlighter Stick

3.8/ 55/18/0

Colgate

Proven Protection Cavity (Fresh Mint)

3.7/ 50/7/3

Browse all products →

Frequently asked questions

What is CI 42090?: CI 42090 is a synthetic color additive, also known as Brilliant Blue FCF or FD&C Blue No. 1, used to impart a blue color to products.
Is CI 42090 safe for use on skin?: CI 42090 is generally considered safe for topical use in cosmetics within regulatory limits, though some individuals may experience mild irritation or allergic reactions.