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<p>[QUOTE=&quot;Bronwen, post: 8159703, member: 5833&quot;]Glass can develop internal fractures that do not break through to the surface.&nbsp; When I was around 11, jewellery made using &quot;fried marbles&quot; was a fad with girls of my age group.&nbsp; It was sold in stores, but friends were making their own by heating marbles on the stove, then plunging them in cold water.&nbsp; They would become crazed on the inside, but stay smooth on the outer surface.[/QUOTE]</p><p><br /></p>

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