Durch Kristallisation aus KF‐Schmelzen unter N2‐Schutzgas werden je nach Präparationsbedingungen dunkelgrüne (NiSO4, MgO, Ni‐Tiegel, 900°C), gelbe (NiSO4, CaO + CaCl2, Pt‐Tiegel, 900°C, 20 h) oder braune (NiSO4, MgO, 900°C, 20 h, Pt‐Tiegel) "NiO"‐Einkristalle erhalten, deren Lichtabsorption beschrieben und diskutiert wird.
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