Process for preparation of inorganic colorants from mixed rare earth compounds
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United States of America Patent
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Oct 9, 2007
Grant Date -
Jun 29, 2006
app pub date -
Dec 23, 2004
filing date -
Dec 23, 2004
priority date (Note) -
Expired
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Abstract
The present invention provides a novel process for preparation of inorganic colourants from mixed rare earth compounds, which are directly obtained from the ore industry, without undergoing any separation, thereby enabling a cost reduction to the extend of 10-100 times. Colors ranging from brown, blue and green can be obtained by suitable doping with other metal ions.
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