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<p>[QUOTE=&quot;808 raver, post: 358720, member: 4654&quot;]My Dad was an Optician, he and my Brother often used to soften glasses frames made of cellulose over an open flame, admittedly if they were left too long they would combust but using a hot pin in my experience just doesn&#039;t have the thermal energy to ignite cellulose. I have used the hot pin test many times to identify ivory without causing any more damage than a tiny black dot, if this is done in a place that can&#039;t be seen then personally I don&#039;t see the problem. I would never recommend filing silver but if they are going to get silver tested then it will have to be damaged in some way to check.[/QUOTE]</p><p><br /></p>

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