{
  "$schema": "https://foodadditiveindex.com/api/v1/schema.json",
  "id": "https://foodadditiveindex.com/additives/synthetic-iron-oxide",
  "slug": "synthetic-iron-oxide",
  "name": "Synthetic iron oxide",
  "identifiers": {
    "e_number": null,
    "ins_number": null,
    "cas_number": "1309-37-1",
    "inchikey": "YOBAEOGBNPPUQV-UHFFFAOYSA-N",
    "pubchem_cid": 56841934
  },
  "functional_class": null,
  "summary": "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.",
  "derivation_summary": "Produced synthetically rather than mined, because natural ores carry heavy metal impurities that the food grade must not.",
  "regulatory_status": [
    {
      "jurisdiction": "US",
      "jurisdiction_name": "United States",
      "authority": "Food and Drug Administration",
      "status": "permitted",
      "status_label": "Permitted",
      "provision_count": 1,
      "provisions": [
        {
          "status": "permitted",
          "food_category": null,
          "max_level": null,
          "max_level_unit": null,
          "conditions": null,
          "effective_from": null,
          "citation": {
            "ref": "21 CFR 73.200",
            "url": "https://www.ecfr.gov/current/title-21/section-73.200"
          },
          "source": "ecfr",
          "retrieved_at": "2026-09-07T18:25:51.549Z"
        }
      ]
    },
    {
      "jurisdiction": "CODEX",
      "jurisdiction_name": "Codex Alimentarius",
      "authority": "Codex Alimentarius Commission / JECFA",
      "status": "not_listed",
      "status_label": "Not listed",
      "note": "Does not appear on this jurisdiction’s permitted list. That is not the same as being prohibited.",
      "provision_count": 0,
      "provisions": []
    }
  ],
  "names": [
    {
      "name": "1309-37-1",
      "type": "cas",
      "source": "openfoodtox"
    },
    {
      "name": "11554 Red",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "Anchred standard",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "Anhydrous Ferric Oxide",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "Anhydrous Iron (III)",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "Anhydrous Iron (III) Oxide",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "Anhydrous iron oxide",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "Anhydrous oxide of iron",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "Armenian bole",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "Bayer S 11",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "Bayferrox 105M",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "Black oxide of iron",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "Calcotone Red",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "Caput mortuum",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "CCRIS 7330",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "Colcothar",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "Colloidal ferric oxide",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "COSMETIC RED OXIDE",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "Crocus martis adstringens",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "Deanox",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "E 172 RED",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "Eisenoxyd",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "English Red",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "Ferric oxide (anhydrous)",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "Ferric oxide (colloidal)",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "Ferric oxide [NF]",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "Ferric oxide, red [NF]",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "Ferric sesquioxide",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "Ferrous-ferric oxide",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "Ferrugo",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "Ferrum Oxydatum",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "Hematite 8124",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "Hematite mineral",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "HSDB 452",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "Indian Red",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "Iron oxide (Fe2O3)",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "Iron oxide dust",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "Iron oxide dust and Fume (Fe2O3)",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "Iron oxide,",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "Iron oxide, red",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "Iron Red",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "Iron sesquioxide",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "Iron trioxide",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "iron(3+) oxide",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "Iron(III) oxide",
      "type": "common",
      "source": "openfoodtox"
    },
    {
      "name": "JEIPFZHSYJVQDO-UHFFFAOYSA-N",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "Jeweler's rouge",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "Jewelers rouge",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "Levanox Red 130A",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "Light Red",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "Mapico Red",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "Mars Brown",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "Mars Red",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "Natural hematite",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "Natural Red Oxide",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "Ochre",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "Prussian Brown",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "Quick rouge",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "Raddle",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "Red Ferric Oxide",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "Red Iron Oxide",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "RED IRON OXIDE R 1599D",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "Red oxide",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "Red oxide D3452",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "Red oxide D6984",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "Red oxide of iron",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "Rouge",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "Synthetic iron oxide",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "YOBAEOGBNPPUQV-UHFFFAOYSA-N",
      "type": "common",
      "source": "pubchem"
    },
    {
      "name": "oxo(oxoferriooxy)iron",
      "type": "iupac",
      "source": "openfoodtox"
    },
    {
      "name": "Synthetic iron oxide",
      "type": "label",
      "source": "ecfr"
    }
  ],
  "hazard_reference_values": [],
  "sources": [
    {
      "key": "ecfr",
      "name": "Electronic Code of Federal Regulations, Title 21",
      "publisher": "U.S. Government Publishing Office / National Archives",
      "licence": "Public domain",
      "url": "https://www.ecfr.gov/api/versioner/v1/full/2026-08-31/title-21.xml",
      "retrieved_at": "2026-09-07T18:25:51.549Z"
    }
  ],
  "citation_policy": "Cite as: Food Additive Index, \"Synthetic iron oxide\", https://foodadditiveindex.com/additives/synthetic-iron-oxide. This site reports regulatory status and does not rate additives.",
  "generated_at": "2026-09-08T00:09:38.735Z"
}