CI 42090 (Blue 1)
A blue cosmetic colorant. It tints the formula at very low levels and does not affect skincare action. Approved for EU cosmetics.
Supporting ingredient
It gives a product its texture, stability or shelf life. It has no claimed effect on the skin, so an efficacy tier does not apply. What is known about its safety is below
Tolerability and safety
- Irritation potential
- Low
- Allergen risk
- Moderate
- Pregnancy
- Safe
- Suitable for
- Normal, Dry, Combination, Oily, Sensitive
About this ingredient
CI 42090 is a synthetic triphenylmethane dye, also known as Blue 1 (Brilliant Blue). The five-digit CI index is a number from the international Colour Index catalogue. INCI: CI 42090. In a formula it gives the product a blue or greenish-blue shade. It is a colorant, not a skincare active. It does not act on skin and is added for color at low concentrations. Regulation. In the EU, cosmetic colorants are governed by Annex IV of Regulation 1223/2009, which lists allowed categories and limits for each. CI 42090 is on that list. Tolerance. Irritation potential is low. Synthetic dyes are occasional contact allergens, so people prone to dye reactions should keep this in mind. Pregnancy safety: trace amounts, systemically negligible.
Frequently asked questions
Is CI 42090 (Blue 1) safe during pregnancy?
CI 42090 (Blue 1) is considered safe during pregnancy at typical cosmetic concentrations. Systemic absorption through the skin is minimal.
What skin types is CI 42090 (Blue 1) for?
CI 42090 (Blue 1) suits: normal, dry, combination, oily, sensitive.
What is CI 42090 (Blue 1) and what does it do in cosmetics?
A blue cosmetic colorant.
What's the INCI name for CI 42090 (Blue 1)?
The INCI name is CI 42090. It may also appear as: Blue 1, Brilliant Blue FCF, Blue 1 Lake.
See CI 42090 (Blue 1) in a product composition right on the store page
The Evigrade extension adds an evidence panel to iHerb, Sephora, Druni and 12 more stores. This ingredient and every other one in the product show evidence-tier, allergen risk and pregnancy/lactation flags at a glance.
Similar role in the formula
Other functional ingredients
Red 27 (CI 45410), Yellow 11 (CI 47000), CI 60730, CI 61565 (Green 6), Hydroxypropylcellulose, PEG/PPG-18/18 Dimethicone, Sodium Carbomer, VP/VA Copolymer
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