dried and calcined in acrucible. The longer the calcination is continued,the more the oxide approaches to a violet hue, andthe harder its grain. At a very high temperaturethe oxide is partly reduced, its colour becomes moregray, and the grain is too hard for polishing. Thered oxide serves for… … CURVKLINEAR FOLIAGE.—(aCANTHUS.) THE decorators ASSISTANT. 95
Design · Decoration and ornament · Art
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