V -Influence of Chlorides and Sulphate JSGT_V01_T087-T096
IN the production of glass, particularly from batches of Iow fusion point, such as those containing lead, it has frequently been the experience of manufacturers to discover that the glass, initially clear, would develop an opalescence when allowed to stand in the pot or when re-heated during the process of casting some article. The degree of opacity depended partly on the period of heating, and might even be a stain or slight cloudiness, or might even be quite dense in character.
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