Synthetic iron oxide
1309-37-1 · 11554 Red · Anchred standard · Anhydrous Ferric Oxide · Anhydrous Iron (III) · Anhydrous Iron (III) Oxide · Anhydrous iron oxide · Anhydrous oxide of iron · Armenian bole · Bayer S 11 · Bayferrox 105M · Black oxide of iron · Calcotone Red · Caput mortuum · CCRIS 7330 · Colcothar · Colloidal ferric oxide · COSMETIC RED OXIDE · Crocus martis adstringens · Deanox · E 172 RED · Eisenoxyd · English Red · Ferric oxide (anhydrous) · Ferric oxide (colloidal) · Ferric oxide [NF] · Ferric oxide, red [NF] · Ferric sesquioxide · Ferrous-ferric oxide · Ferrugo · Ferrum Oxydatum · Hematite 8124 · Hematite mineral · HSDB 452 · Indian Red · Iron oxide (Fe2O3) · Iron oxide dust · Iron oxide dust and Fume (Fe2O3) · Iron oxide, · Iron oxide, red · Iron Red · Iron sesquioxide · Iron trioxide · iron(3+) oxide · Iron(III) oxide · JEIPFZHSYJVQDO-UHFFFAOYSA-N · Jeweler's rouge · Jewelers rouge · Levanox Red 130A · Light Red · Mapico Red · Mars Brown · Mars Red · Natural hematite · Natural Red Oxide · Ochre · Prussian Brown · Quick rouge · Raddle · Red Ferric Oxide · Red Iron Oxide · RED IRON OXIDE R 1599D · Red oxide · Red oxide D3452 · Red oxide D6984 · Red oxide of iron · Rouge · Synthetic iron oxide · YOBAEOGBNPPUQV-UHFFFAOYSA-N · oxo(oxoferriooxy)iron · Synthetic iron oxideCAS 1309-37-1
Synthetic iron oxides give red, yellow, brown and black, used in confectionery, sausage casings and pet food. They are the same pigments as ochre and rust, made to a controlled purity.
Where it is and isn’t permitted
| Jurisdiction | Status | Scope and limits | Citation |
|---|---|---|---|
| United States | Permitted | 21 CFR 73.200retrieved 2026-09-07 | |
| Codex Alimentarius | Not listedDoes not appear on this jurisdiction’s permitted list. That is not the same as being prohibited. |
What it is made from
Produced synthetically rather than mined, because natural ores carry heavy metal impurities that the food grade must not.
- Vegan
- Vegetarian
- CAS registry number
- 1309-37-1
- InChIKey
- YOBAEOGBNPPUQV-UHFFFAOYSA-N
- PubChem
- CID 56841934
Every name it appears under
71 recorded names. A label may use any of them.
CAS registry number
- 1309-37-1
As it appears in regulation
- Synthetic iron oxide
Other names
- 11554 Red
- Anchred standard
- Anhydrous Ferric Oxide
- Anhydrous Iron (III)
- Anhydrous Iron (III) Oxide
- Anhydrous iron oxide
- Anhydrous oxide of iron
- Armenian bole
- Bayer S 11
- Bayferrox 105M
- Black oxide of iron
- Calcotone Red
- Caput mortuum
- CCRIS 7330
- Colcothar
- Colloidal ferric oxide
- COSMETIC RED OXIDE
- Crocus martis adstringens
- Deanox
- E 172 RED
- Eisenoxyd
- English Red
- Ferric oxide (anhydrous)
- Ferric oxide (colloidal)
- Ferric oxide [NF]
- Ferric oxide, red [NF]
- Ferric sesquioxide
- Ferrous-ferric oxide
- Ferrugo
- Ferrum Oxydatum
- Hematite 8124
- Hematite mineral
- HSDB 452
- Indian Red
- Iron oxide (Fe2O3)
- Iron oxide dust
- Iron oxide dust and Fume (Fe2O3)
- Iron oxide,
- Iron oxide, red
- Iron Red
- Iron sesquioxide
- Iron trioxide
- iron(3+) oxide
- Iron(III) oxide
- JEIPFZHSYJVQDO-UHFFFAOYSA-N
- Jeweler's rouge
- Jewelers rouge
- Levanox Red 130A
- Light Red
- Mapico Red
- Mars Brown
- Mars Red
- Natural hematite
- Natural Red Oxide
- Ochre
- Prussian Brown
- Quick rouge
- Raddle
- Red Ferric Oxide
- Red Iron Oxide
- RED IRON OXIDE R 1599D
- Red oxide
- Red oxide D3452
- Red oxide D6984
- Red oxide of iron
- Rouge
- Synthetic iron oxide
- YOBAEOGBNPPUQV-UHFFFAOYSA-N
Systematic names
- oxo(oxoferriooxy)iron
Hazard reference values
No reference value for this substance in the sources we hold.
Evidence and how bodies read it
Studies, and the differing conclusions regulators drew from them, are curated by hand rather than machine-read, and none has been written for this substance yet.
Sources for this page
- ecfr retrieved 2026-09-07
Full licence terms and publisher details on Sources. How this page is built and updated: Method.
Machine-readable:/api/v1/additives/synthetic-iron-oxide.json