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Commission Regulation (EU) No 231/2012Show full title

Commission Regulation (EU) No 231/2012 of 9 March 2012 laying down specifications for food additives listed in Annexes II and III to Regulation (EC) No 1333/2008 of the European Parliament and of the Council (Text with EEA relevance)

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E 172 IRON OXIDES AND IRON HYDROXIDES

SynonymsIron Oxide Yellow: CI Pigment Yellow 42 and 43
Iron Oxide Red: CI Pigment Red 101 and 102
Iron Oxide Black: CI Pigment Black 11
DefinitionIron oxides and iron hydroxides are produced synthetically and consist essentially of anhydrous and/or hydrated iron oxides. The range of hues includes yellows, reds, browns and blacks. Food quality iron oxides are primarily distinguished from technical grades by the comparatively low levels of contamination by other metals. This is achieved by the selection and control of the source of the iron and/or by the extent of chemical purification during the manufacturing process.
Colour Index NoIron Oxide Yellow:77492
Iron Oxide Red:77491
Iron Oxide Black:77499
EinecsIron Oxide Yellow:257-098-5
Iron Oxide Red:215-168-2
Iron Oxide Black:235-442-5
Chemical nameIron Oxide Yellow: hydrated ferric oxide, hydrated iron (III) oxide
Iron Oxide Red: anhydrous ferric oxide, anhydrous iron (III) oxide
Iron Oxide Black: ferroso ferric oxide, iron (II, III) oxide
Chemical formulaIron Oxide Yellow:FeO(OH) · H2O
Iron Oxide Red:Fe2O3
Iron Oxide Black:FeO.Fe2O3
Molecular weight88,85:FeO(OH)
159,70:Fe2O3
231,55:FeO.Fe2O3
AssayYellow not less than 60 %, red and black not less than 68 % total iron, expressed as iron
DescriptionPowder; yellow, red, brown or black in hue
Identification
Solubility

Insoluble in water and in organic solvents

Soluble in concentrated mineral acids

Purity
Water soluble matterNot more than 1,0 %By total dissolution
ArsenicNot more than 3 mg/kg
CadmiumNot more than 1 mg/kg
ChromiumNot more than 100 mg/kg
CopperNot more than 50 mg/kg
LeadNot more than 10 mg/kg
MercuryNot more than 1 mg/kg
NickelNot more than 200 mg/kg
ZincNot more than 100 mg/kg

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