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<p>[QUOTE=&quot;TallCakes, post: 103607, member: 107&quot;]hard to say for sure; the way to check for manganese content in glass is to look at it under UV light in total darkness where the edges and thick design areas will show as yellow-green. The blue one does have manganese, but the other colors are difficult to really tell; green still look green under UV. Manganese was/is used to obtain clarity in the glass. Manganese began to be used in glass during the Civil War era in the USA as lead was being diverted for the war effort; thus much EAPG contains manganese. Earlier glass containing lead is called flint glass.</p><p><br /></p><p>Not saying that there are folks who may like/enjoy sun-purpled glass. But that does not make it more desirable and many serious collectors deem it damaged. Unfortunately (especially for rarer EAPG) intentionally damaging glass in this manner diminishes the availability of quality crystal clear glass.[/QUOTE]</p><p><br /></p>

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