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<p>[QUOTE=&quot;Cherryhill, post: 854041, member: 70&quot;]There seems to be some confusion about opalescence. Its all dependent on what&#039;s in the glass. To make glass opalescent, the batch must include some bone ash. Once the piece has its final form, or at least is removed from the mold (swung vases come to mind) the areas that the worker wants to make opalescent is chilled with a blast of cool air. This precipitates something in the in the bone ash to make the glass white. The glass may be reheated to be formed a bit more, swung or ruffled, or what ever. Then it is sent to the lehr to be slowly cooled. Glass that is meant to be opaque (white) is not treated this way, it&#039;s got other chemicals in it, usually tin oxide. Any clear colored glass can be made opalescent.[/QUOTE]</p><p><br /></p>

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