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<p>[QUOTE=&quot;spock1k, post: 519833, member: 7043&quot;]i never said chemically it alters the surface i merely said it alters the surface kind of like makeup if you will. it can hide the color and it can hide nicks hence a coin can get a diff grade.&nbsp; i am also not saying it does not protect- in fact many museums across the world use a form of oil to protect their coins.&nbsp; one has to be very careful with 2 things</p><p><br /></p><p>one the science is always evolving for good or bad</p><p>two TPG are built on a certain premise and the best way to preserve coins might not be the best way to get a coin graded in all cases[/QUOTE]</p><p><br /></p>

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