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Red Iron Oxide (CI 77491)
AKA “Iron trioxide, Iron oxide, red, iron(3+) oxide, Anhydrous Ferric Oxide, Anhydrous Iron (III) Oxide”
Ingredient
Ingredient Facts
Red iron oxide (CI 77491)
AKA: Iron trioxide, Iron(3+) oxide, Anhydrous Ferric Oxide, Anhydrous Iron (III) Oxide
Ingredient · Opacifying · EWG: 4
Synthetic
Colorant
Not Clean
Red Iron Oxide (CI 77491) is a cosmetic ingredient.
CAS #
1309-37-1, 1317-61-9, 1345-27-3, 52357-70-7, 1345-25-1
Form
Powder
State
Solid
See origin →
Functions
Opacifying
Cosmetic Colorant
Gives the product its color. Purely aesthetic — makes the formula look good in the jar but does nothing for your skin.
Skin Types
●all-skin-types
Best For
General
Pregnancy & Breastfeeding Safe
Yes
EWG
4
CIR
Safe
Pregnancy
Yes
CIR Safety Findings
all-shades-safe
Regulatory Status
USA✔ permitted
EU⚠ restricted
JAPAN⚠ restricted
CANADA⚠ restricted
Verified Jun 2026
Data: CosIng · EWG · CIR