Composition for colouring glass and uses thereof
AssigneeVERTRICERAMICI S.p.A.
InventorMichele BETTOLI
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Abstract
The present invention relates to a coloring composition free of nickel oxide. In particular, the coloring composition for glass comprises manganese dioxide (MnO2), chromium oxide (III) (Cr2O3), cobalt oxide (Co3O4) and a glass medium. Furthermore, the present invention relates to the process for producing the coloring composition and the use thereof for the purpose of imparting a dark color (black), in particular a blue-violet-black color, to the glass.
Claims20
A coloring composition for glass, free of nickel oxide, comprising:
- 35-50% by weight of MnO2;
- 4-10% by weight of Cr2O3;
- 0.5-1.5% by weight of Co3O4;
- and
- 40-60% of a glass medium,
A process in accordance with claim 15, wherein said composition or granule is added at a concentration which ranges between 1 and 6%, relative to the molten glass matrix.
Dependencies are inferred from the claim text.