Quite obviously mixtures of grades different from the above may be prepared by adding varying quantities of the ingredients named or of certain other ingredients in addition, such as kaolin, and then subjecting the whole to a mixing process, the higher grades of the lithopone containing the higher percentages of zinc sulfid. This has up to the present time been the actual method pursued in making commercial lithopone of different grades, although one not eminently satisfactory.
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This intermediate compound is then refined further and reacted with oxygen at high temperatures to yield titanium dioxide This intermediate compound is then refined further and reacted with oxygen at high temperatures to yield titanium dioxide