University of Illinois Bulletin, Vol. 10
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| Hersteller: | Forgotten Books (Illinois, University Of; Dept; Of Cerami) |
| Stand: | 2015-08-04 03:50:33 |
Produktbeschreibung
Excerpt from University of Illinois Bulletin, Vol. 10: Bulletin No; 16 The color imparted to a glass or glaze depends upon the kind of coloring oxide, the composition of the batch and the manner of heat treatment. It has been considered that cobalt is persistent in producing blue under all conditions. Since two or more distinct colors are obtainable from all other coloring oxides under different conditions, there seemed to be no logical reason why some color other than blue could not be obtained from cobalt oxide. Since cobalt oxide has so persistently given blue colors under normal ceramic practice, it was evident that a departure in composition must be made from the ordinary commercial types of glazes if a color different from blue was to be developed from cobalt oxide. A speculation as to the possible colors obtainable from cobalt oxide as the sole colorant is of interest. Cobalt salts in solution under certain conditions impart pink, while under other conditions the color imparted is blue. It, therefore, seemed possible to develop all the different shades from blue on one hand to pink or even light red on the other. The problem was to develop a type of glaze that would bring out the pink or red color if such were possible, and the key to the situation was found in blowpipe analysis. Magnesia and magnesium minerals containing cobalt, when powdered, moistened with a solution of cobalt nitrate and heated, give a pink color. Alumina and alumina minerals containing cobalt, when similarly treated, give blue. This suggested a glaze high in magnesia and free from alumina. It was recognized that if such colors could be produced they would be of greatest value for low temperature work. Since a high content of magnesia imparts refractoriness to a glaze, it would be necessary to introduce a "softener" which would not influence the color toward the blue. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.
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