Publisher's Synopsis
Excerpt from Opalescence and the Function of Boric Acid in the Glaze
M r. Bleininger: It will be noticed that the results of the work, porosity and di-electric strength, are not re ferred to the chemical composition but to the percentages of clay, feldspar and quartz. The chemical composition has been used for the purpose of classification for which purpose I maintain that it is closer to the facts than any hypothetical mineral composition.
Mr. Purely: There is one other point in that connec tion. Of course, in the bodies we do not completely fuse the mix. Such a procedure would result in distorted ware. Synthetically made porcelain, unless made. From fritted or calcined material, will not be of the same sort as those porcelains you have exhibited here.' i have seen porcelain glazes attempted synthetically. They were failures. The same would be true in porcelain bodies. While working in a ?oor tile factory, I attempted the duplication of cer tain French porcelain on basis of chemical composition. I failed. The same can be said for any ceramic body and nearly all of the alkaline earth glazes.
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