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<p>[QUOTE=&quot;afantiques, post: 82160, member: 25&quot;]A salt is a chemical term for a compound which does not have to be sodium chloride, the common salt we eat. Uranium hexafloride is a salt of uranium but I doubt if the Victorians used that as it employed in the enriching of uranium in&nbsp; a gas centrifuge.</p><p><br /></p><p>They probably ground up a mineral rich in uranium to add to the basic glass mix, because they liked the colour of the resultant glass. Also there is UV in sunlight so some slight colour may have been seen in the sun.</p><p><br /></p><p>There is a precise chemical definition of a&#039;salt&#039; but I can&#039;t recall it offhand. It is just a coincidence they used a florescent substance, many flowers have brighter UV appearances but no UV lamps were involved in their evolution, just UV sensitive eyes in insects.</p><p><br /></p><p>Many elements were known in mineral form before being isolated as elements.</p><p><br /></p><p>Most of them probably found&nbsp; their way into glass ,just to see what happened.[/QUOTE]</p><p><br /></p>

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