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<p>[QUOTE=&quot;TallCakes, post: 179241, member: 107&quot;]Manganese was widely used to increase clarity in glass during the U.S. civil war, as lead was diverted to ammunitions. Clarifying agents started to change at the time of WWI as manganese was difficult to obtain. Manganese is what causes this glass to turn purple when overexposed to UV rays and also glow green-yellow under black light. So the glow <i>may</i> be an indicator of age when comparing reproductions. However, newer glass does also contain manganese; so it&#039;s not a definitive indication of age. For example, Fostoria used manganese in their crystal &#039;Coin&#039; pattern.[/QUOTE]</p><p><br /></p>

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