Natural iron chromate. Stain for engobes, glazes and stoneware bodies. Its colour palette ranges from gray to brown to black. Zusätze von 2-5%.
(Fe, Mg)O * (Cr Al)2O3 - Portachrom A 38
Chem. analysis in %:
Cr2O3 45.0; Al2O3 14.5; FeO 24.5; MgO 11.0; CaO 0.3; MnO 0.25; Na2O 0.4; SiO2 3.0; TiO2 0.5.
Grinding fineness in %:
> 75 µm - 0.01.
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