Altogether somewhat darker stains than iron oxide red. Additions 1-5%. In stoneware glazes usually not firing stable.
Fe3O4 - Molar weight: 232
Chem. analysis in %:
Fe2O3 94-96; SiO2/Al2O3 3.00; Loss of ignition (1000°C) 4.00.
Grinding fineness in %:
> 45 µm 0.1; primary particle size 0.3 µm.
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