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<p>[QUOTE=&quot;Insider, post: 4418076, member: 24314&quot;]HOW REFRESHING.&nbsp; It is a rare person who will admit to &quot;fails.&quot;&nbsp;&nbsp; This result would not go over at a TPGS Conservation Service.&nbsp; That may be the reason this method is not used to the best of my knowledge.&nbsp; Nevertheless, whomever was the first to discover what you have shown is a genius.</p><p><br /></p><p>Before conservation is attempted (only at some places) the spot is examined under a microscope.&nbsp; Many of these spots result from a tiny piece of imbedded debris.&nbsp; When the color is removed the debris remains.&nbsp; If not, their is a depression in the surface where it was.[/QUOTE]</p><p><br /></p>

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