Ingredient review
CI 40850
INCI: CI 40850
CI 40850 is a widely used synthetic yellow colorant in cosmetics, generally considered safe at low concentrations but may cause sensitivity in rare cases.
In plain English
CI 40850 is a man-made yellow dye that's added to makeup and skincare products to give them color. It's also called Yellow 10 Lake. Think of it like food coloring for your cosmetics—it doesn't do anything for your skin except make the product look a certain shade. It's been reviewed by safety panels and is considered safe in the tiny amounts used in beauty products, but if you have very sensitive skin, you might want to patch-test products with this ingredient.
Review score
Safety, usefulness, and evidence
Useful in the right context, but not low-maintenance
The evidence base is useful, but some claims depend heavily on the formula.
Risk flags are low for most users, though the finished product can still irritate.
- Source
- synthetic
- Evidence
- moderate
- Irritation
- low
- Clogging risk
- low
Quick decision guide
Read the cautions before using
CI 40850 is generally a lower-concern ingredient when the full formula suits your skin.
Plain-English read
Treat this as a practical screening step before you compare products that contain this ingredient.
- Step 1Start with the score, then check the irritation and clogging risk before judging CI 40850.
- Step 2Use the "Best for" and "Use caution if" sections to match the ingredient to your skin, not just to a marketing claim.
- Step 3If a product stings, breaks you out, or worsens irritation, judge the finished formula and stop using it even if the ingredient scores well.
Score terms in plain English
Irritation risk
lowLess likely to sting, burn, or bother most users, though sensitive skin can still react.
Clogging risk
lowLess likely to feel heavy or contribute to clogged pores for most skin types.
Evidence level
moderateThere is useful support, but formula details and claim strength still matter.
What it is
CI 40850 is a synthetic organic pigment, specifically an aluminum lake of Acid Yellow 3. It is produced through a chemical process that binds the dye to an aluminum salt, making it insoluble in water and stable in cosmetic formulations.
How it works
In a cosmetic product, CI 40850 works purely as a colorant. It sits on the surface of the skin or hair, reflecting and absorbing light to create a yellow color. It does not interact with the skin's biology or provide any skincare benefits.
Pros
Vibrant and stable color
CI 40850 delivers a bright, consistent yellow shade that doesn't fade or change easily in the product over time, so your makeup looks the same from first use to last.
Widely accepted as safe
Regulatory bodies like the FDA and EU CosIng have reviewed this colorant and approved its use in cosmetics at low levels, giving you confidence in its safety profile.
Cons and cautions
Synthetic origin
If you prefer plant-based or naturally derived ingredients, this synthetic dye may not align with your clean beauty values, as it's made from petroleum derivatives.
Potential for skin sensitivity
Though rare, some people with very reactive skin may experience irritation or allergic contact dermatitis from this colorant, especially in products used around the eyes or lips.
Best for
- Anyone using conventional color cosmetics who is not sensitive to synthetic dyes
- Makeup users looking for bright, long-lasting yellow shades
Use caution if
- Individuals with known allergies or sensitivities to synthetic colorants, especially lakes
- Those strictly following natural or organic beauty routines
Usage tips
Safety summary
CI 40850 is considered safe for use in cosmetics at the low concentrations typically employed. The Cosmetic Ingredient Review (CIR) panel has reviewed similar colorants and found them safe. However, as with any ingredient, individual sensitivity is possible, and patch testing is recommended for those with a history of reactions to makeup.
Research notes
Research on CI 40850 specifically is limited, but it is part of a class of color additives that have been extensively reviewed by regulatory bodies. Studies on similar lake pigments indicate low acute toxicity and minimal skin penetration, supporting their safety in leave-on and rinse-off cosmetics.
Common label clues
- Typical concentration
- Typically used at very low concentrations (less than 1%) to achieve desired color.
- Regulatory status
- Approved for use in cosmetics in the US (FDA) and EU (CosIng) at concentrations up to 100% for external use, though typical use is far lower. Always check local regulations as they may vary.
- Common uses
- Lipsticks, Eyeshadows, Blushes, Nail polishes, Facial makeup
- Environmental note
- As a synthetic colorant, CI 40850 is derived from non-renewable petroleum sources and may not be biodegradable. Its production and disposal can contribute to environmental pollution if not managed properly.
Good to know
- CI 40850 is often listed as 'Yellow 10 Lake' on ingredient labels in the US and Europe.
- This colorant is not water-soluble, so it stays put on the skin and doesn't run easily.
Common questions
What is CI 40850 in beauty products?
CI 40850 is a man-made yellow dye that's added to makeup and skincare products to give them color. It's also called Yellow 10 Lake. Think of it like food coloring for your cosmetics—it doesn't do anything for your skin except make the product look a certain shade. It's been reviewed by safety panels and is considered safe in the tiny amounts used in beauty products, but if you have very sensitive skin, you might want to patch-test products with this ingredient.
What does CI 40850 do in a beauty product?
In a cosmetic product, CI 40850 works purely as a colorant. It sits on the surface of the skin or hair, reflecting and absorbing light to create a yellow color. It does not interact with the skin's biology or provide any skincare benefits.
Is CI 40850 safe for most people?
CI 40850 is considered safe for use in cosmetics at the low concentrations typically employed. The Cosmetic Ingredient Review (CIR) panel has reviewed similar colorants and found them safe. However, as with any ingredient, individual sensitivity is possible, and patch testing is recommended for those with a history of reactions to makeup.
Who should be careful with CI 40850?
Individuals with known allergies or sensitivities to synthetic colorants, especially lakes Those strictly following natural or organic beauty routines
Research sources
Ingredient reviews are educational and are not medical advice. Patch test new products and ask a licensed clinician about persistent irritation, allergies, pregnancy-specific questions, or diagnosed skin conditions.