Iron Oxides
Ci 77491/77492/77499
Characteristics
- INCI
- Iron Oxides
- Ru.
- Ci 77491/77492/77499
- Irritancy
-
0 / 5
Irritation potential: 0–5, where 5 is the highest irritation rating for the ingredient.
More detail → - Comedogen.
-
0 / 5
Comedogenicity index: 0–5. A non-comedogenic ingredient (0–1) is unlikely to cause cosmetic acne.
More detail →
Who it's for
Description
If you’ve ever wondered why foundation, concealer and tinted sunscreen can look so nicely “skin-like” instead of suspiciously orange or grey, chances are iron oxides are doing some of the heavy lifting. This is not one single pigment but a family of mineral colorants, usually listed as CI 77491 for red, CI 77492 for yellow and CI 77499 for black. Mix them in different ratios and you can make a very convincing range of beige, tan, deep brown and everything in between. In other words, they’re the unglamorous heroes behind a lot of the “best iron oxide foundation” and “best iron oxide pigments” searches out there.
In cosmetics, iron oxides are valued mainly because they are stable, opaque and generally very well tolerated. They don’t give your skin some dramatic overnight transformation, but they do help with coverage, tone correction and making products look less chalky. They’re also popular in sunscreens, especially tinted ones, because they can help reduce visible light exposure. That matters for people dealing with melasma or post-inflammatory hyperpigmentation, since visible light can worsen pigmentation in some skin tones. A 2010 study found that a tinted sunscreen containing iron oxides was more effective than a non-tinted sunscreen at preventing visible light-induced pigmentation in melasma-prone skin over an 8-week period, which is why “best iron oxide sunscreen for face” and “best iron oxide sunscreen melasma” are such common searches.
As for actual health benefits, iron oxides are not skincare actives in the usual sense. They don’t hydrate, exfoliate or boost collagen, but they can support your routine by adding coverage and helping cosmetic products wear more evenly. In makeup, they’re the color workhorses in blush, bronzer, lipstick and yes, the elusive “best iron oxide tinted sunscreen.” If you’ve ever gone down the rabbit hole of how to make iron oxide, how to use iron oxide, or even how to use red iron oxide on clay, that’s because the same broad pigment family is used far beyond cosmetics, including ceramics and industrial applications. Just don’t confuse cosmetic-grade pigments with pottery or thermite-grade materials; skincare needs the purified, regulated version, not the DIY science-project one.
And if you’re wondering how to write iron oxide, the answer in ingredient lists is usually exactly as you’d expect: “iron oxides,” sometimes followed by the CI number. The take-home message? They’re not the flashiest ingredients in the cabinet, but they are some of the most useful. For makeup and sunscreen, that makes them very much a best-in-class colorant, even if they’ll never get the same fan club as niacinamide.
More detail
A bit of a sloppy ingredient name as it covers not one but three pigments: red, yellow and black iron oxide.
The trio is invaluable for "skin-colored" makeup products (think your foundation and pressed powder) as blending these three shades carefully can produce almost any shade of natural-looking flesh tones.
Frequently Asked Questions about Iron Oxides
What are iron oxides used for in cosmetics?
Are iron oxides safe in skincare and makeup?
Do iron oxides have any benefits for skin?
Why are iron oxides added to sunscreens?
Can iron oxides cause side effects or skin reactions?
Products with Iron Oxides (7 260 total)
Most often found in Shiseido products (137 items)
