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<p>[QUOTE="Insider, post: 2564700, member: 24314"]I have a copy of White's book. I've had some disagreements with his opinion about toning. While he is correct that it is "damage" to a coin's surface, many of those "damaged" coins bring sensational prices. One numismatic columnist has written "tongue-in-cheek" that he would buy all the "beautifully damaged" coins Dr. White could sell him!</p><p><br /></p><p><br /></p><p>In 2002, I've seen a chemist experiment with TPGS slabs using a fume hood and a sealed bag with that gas. He was testing the permeability of the holders. At the time, the coins in each TPGS slab toned - some more than others. </p><p>Somehow, he got a whiff of the Hydrogen Sulfide and started choking. At the time, I did not realize how dangerous the gas was (even though he warned me before the experiment) until I saw it in action![/QUOTE]</p><p><br /></p>
[QUOTE="Insider, post: 2564700, member: 24314"]I have a copy of White's book. I've had some disagreements with his opinion about toning. While he is correct that it is "damage" to a coin's surface, many of those "damaged" coins bring sensational prices. One numismatic columnist has written "tongue-in-cheek" that he would buy all the "beautifully damaged" coins Dr. White could sell him! In 2002, I've seen a chemist experiment with TPGS slabs using a fume hood and a sealed bag with that gas. He was testing the permeability of the holders. At the time, the coins in each TPGS slab toned - some more than others. Somehow, he got a whiff of the Hydrogen Sulfide and started choking. At the time, I did not realize how dangerous the gas was (even though he warned me before the experiment) until I saw it in action![/QUOTE]
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