Mineral & Iron Oxide Pigments

Synthetic-grade iron oxides — red (Fe₂O₃), yellow (FeOOH·H₂O), and black (Fe₃O₄) — are inorganic mineral pigments with two distinct cosmetic functions. As pigments they deliver stable, opaque, hypoallergenic colour across a broad tone range without organic-dye photosensitivity. As secondary photoprotectants they absorb meaningfully across the visible-light and HEV blue-light range (400–500 nm) — the mechanism behind tinted-SPF's documented superiority to untinted equivalents in melasma and PIH-prone skin, where visible light is a non-trivial pigmentation trigger. Coated pigments (silica, jojoba ester, dimethicone-alternative surface treatments) improve dispersibility and skin-feel.

0.5–5% total iron oxide in tinted SPF / foundation

Coated pigments (silica, jojoba ester) for skin-feel and water-dispersibility in clean lines. Carmine is the historical red — modern clean brands replace with synthetic iron oxide reds for vegan positioning. Avoid lake dyes for clean credentials.

'Mineral makeup' often contains synthetic micas and pigments alongside true minerals — the clean spectrum is uneven. Mica supply chain (child labor in Indian micaregions) is the open ethics question; certified mica (RMI) addresses it.

Mica (often co-formulated with iron oxides as a pearlising base) carries the well-documented Indian child-labour supply-chain concern — Responsible Mica Initiative–certified or synthetic-mica sourcing is the meaningful disclosure. Carmine, the historical red, is animal-derived and increasingly replaced with synthetic iron-oxide reds in vegan-positioned lines, though carmine still anchors many luxury lipsticks.

The category's most genuinely 'multitasking' actives — colour, coverage, and visible-light photoprotection in one ingredient class. The tinted-SPF revolution that ILIA, Saie, and Tower 28 led between 2021 and 2025 essentially rests on iron oxide chemistry.