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<p>[QUOTE=&quot;TallCakes, post: 284875, member: 107&quot;]it&#039;s manganese in glass that causes it to &#039;sun-purple&#039; over an extended time. Sun-purpling is a very light compared to the dark amethyst that is the result of artificial gamma irradiation used in food service to kill microorganisms.[/QUOTE]</p><p><br /></p>

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