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<p>[QUOTE=&quot;physics-fan3.14, post: 768680, member: 19165&quot;]Great question sponge. </p><p><br /></p><p>Dipping to remove toning affects luster because the toning affects luster. The surface of the coin is where the flowlines are which produce luster - it is also the top layers of a coin where the silver sulfide forms. It is the top layer of silver which reacts with the sulfer to form silver sulfide (some of the silver in the coin must react with the sulfer - its not just a film which is deposited). When you then remove the toning by dipping, you are removing the top surface of the coin - which is exactly the same silver which held the flowlines which produced luster. </p><p><br /></p><p>Dipping removes a measurable amount of silver, and damages the luster. It is primarily for this reason that some argue toning is damage.</p><p><br /></p><p>For more information on luster, read my article which I linked in one of my posts in this thread.[/QUOTE]</p><p><br /></p>

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