With iron impured manganese dioxide. Normally stains glazes brown. Alkaline glazes becomes brown violet.
MnO2 - Molar weight: 87 - 81%
Chem. analysis in %:
MnO2 75.0; MnO 1.49; Fe2O3 1.07; Al2O3 2.76; CaO 2.14; MgO 1.37; SiO2 8.75; BaO 1.23. (Mn 48.364; Fe 0.748)
Grinding fineness in %:
< 40 µm - 90
Only remnants available.
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