Bulletin . ases. In all cases where the glazes did not flow ex-cessively or where crystallization appeared, the red-violet colorwas prominent. Where excessive flow took place the glazeremaining on the surface of the vase was a clear blue. In severalcases where the glaze flowed down over fire clay buttons usedas setters, the color of the glaze on these buttons was a darkgreen. The best glazes in the group are E 3, E 4, E 5, F 3, F 4, F 5,G 3, G 4 and G 5. Member F 4 appeared to be the best one in allthree burns. Third Group.—A third group was made in order to obtainlighter shades of the red-vio
Bulletin . ases. In all cases where the glazes did not flow ex-cessively or where crystallization appeared, the red-violet colorwas prominent. Where excessive flow took place the glazeremaining on the surface of the vase was a clear blue. In severalcases where the glaze flowed down over fire clay buttons usedas setters, the color of the glaze on these buttons was a darkgreen. The best glazes in the group are E 3, E 4, E 5, F 3, F 4, F 5,G 3, G 4 and G 5. Member F 4 appeared to be the best one in allthree burns. Third Group.—A third group was made in order to obtainlighter shades of the red-violet color. Since F 4 seemed to holdthe color so persistently and showed a fair range of temperature,it was selected as the starting point. Tighter shades can beproduced by blending F 4 with a similar glaze but containingno cobalt oxide. The first problem to solve was to produce sucha glaze having the same heat range and fusibility as F 4. Inorder to save time it was decided to make a triaxial group (Chart. Purple Produced by Use of Cobalt Na. O ] G-5 at cone 0 Mg O B^ O3 1 Si Co O COBALT COLORS OTHER THAN BLUE. 13 Vfl^^A^.C^/f^CPC i<C?Z ^/y^ C/h^/?r Z
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Keywords: ., bookcentury1900, bookdecade1900, bookpublisherurbana, bookyear190
