Staining in glazes ranges from honey yellow to dark brown, at addition from 1-8%.
Fe2O3 - Molar weight: 160
Chem. analysis in %:
Fe2O3 95-97; SiO2/ Al2O3 4.0; Loss of ignition 1000°C- 0.6.
Grinding fineness in %:
> 45 µm - 0.06; primary particle size 0.17 µm
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