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<p>[QUOTE=&quot;Cherryhill, post: 618152, member: 70&quot;]Sand, about 1/2 of all glass has some iron in it. The iron causes the glass to have a green color to it, (Think of fruit jars)&nbsp; Manganese removes the green of iron making the glass water white. </p><p><br /></p><p>Flint glass is/was half sand, half Lead oxide. During the Civil War, the price of lead increased in cost by about 500%. In 1863-4, Wm Leighton developed a formula for glass using instead of Lead Oxide, bicarbonate of soda. Glass made with this instead of Lead oxide, has come to be called lime glass. </p><p>Flint glass mostly reflects the black light, perhaps having a slight blue color.&nbsp; Lime glass exhibits a pale green under black light.[/QUOTE]</p><p><br /></p>

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