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My Understanding (Flawed?) of Cleaning a Coin by Dipping
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<p>[QUOTE="Frankcoins.com, post: 1433424, member: 16048"]Thiourea-based "dip" like E-Z-Est, or its former name JewelLuster, works by breaking up tarnish (silver sulfide) and leaving the silver on the coin while the sulfide goes into the air as hydrogen sulfide (rotten egg smell) The product does not work by the "acid eating away tarnish and metal" as often repeated on coin discussion boards. A very mild acid is used simply because the chemical reaction works only in an acid environment. Repeated tarnish-dip-tarnish-dip cycles changes the arrangement of the outer atoms of silver, dulling the luster a bit with each cycle (even though no net silver is REMOVED) thus the eventual deeming of the coin as OVERDIPPED, white but lifeless.[/QUOTE]</p><p><br /></p>
[QUOTE="Frankcoins.com, post: 1433424, member: 16048"]Thiourea-based "dip" like E-Z-Est, or its former name JewelLuster, works by breaking up tarnish (silver sulfide) and leaving the silver on the coin while the sulfide goes into the air as hydrogen sulfide (rotten egg smell) The product does not work by the "acid eating away tarnish and metal" as often repeated on coin discussion boards. A very mild acid is used simply because the chemical reaction works only in an acid environment. Repeated tarnish-dip-tarnish-dip cycles changes the arrangement of the outer atoms of silver, dulling the luster a bit with each cycle (even though no net silver is REMOVED) thus the eventual deeming of the coin as OVERDIPPED, white but lifeless.[/QUOTE]
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My Understanding (Flawed?) of Cleaning a Coin by Dipping
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