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<p>[QUOTE=&quot;Cherryhill, post: 219081, member: 70&quot;]Drat, I cleaned my cache, should have logged in and didn&#039;t and wrote basically the following which disappeared when I logged in.</p><p><br /></p><p>Perusing an old glass formula book I found a batch labeled &quot;Casing Opal.&quot; the ingredients listed were Sand, 50 lbs, Soda, 14, Lead, 35 1/2, Niter, 3,&nbsp; Arsenic, 3, Bone, 3. </p><p>The comment &quot;Shows fire over Light.&quot; I expect the &quot;fire&quot; is what we are discussing above. Bone, or Bone Ash is the ingredient added to make clear glass strike opalescent when struck, cooled and reheated.&nbsp; This formula includes the comment &quot;Not very dense.&quot;[/QUOTE]</p><p><br /></p>

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