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<p>[QUOTE="Coin Armour, post: 1769529, member: 43971"]Toning and tarnish are actually caused by the same thing....exposure to harmful gases. There is no difference. The only difference is the definition that collectors assign to them. Toning may look attractive but tarnish has negative implications. Either way they are one in the same. Also, toning/tarnish will continue to damage the surface of coin unless properly protected.</p><p> </p><p>Yes, cardboard will emit sulfur over time (same issue as paper deterioration, which is why CGC places sheets inside graded comics to neutralize gases)...which is bad for coins. Also, both PCGS and NGC slabs are not air-tight.[/QUOTE]</p><p><br /></p>
[QUOTE="Coin Armour, post: 1769529, member: 43971"]Toning and tarnish are actually caused by the same thing....exposure to harmful gases. There is no difference. The only difference is the definition that collectors assign to them. Toning may look attractive but tarnish has negative implications. Either way they are one in the same. Also, toning/tarnish will continue to damage the surface of coin unless properly protected. Yes, cardboard will emit sulfur over time (same issue as paper deterioration, which is why CGC places sheets inside graded comics to neutralize gases)...which is bad for coins. Also, both PCGS and NGC slabs are not air-tight.[/QUOTE]
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