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<p>[QUOTE=&quot;lrbguy, post: 3980713, member: 88829&quot;]Saving one&#039;s self a bit of work is a very different motivation from doing one&#039;s best for the preservation of the coin while trying to make it more presentable.&nbsp; The problem with your solution is that ancient alloys are not sufficiently uniform for one to be SURE what effect a given concentration of a chemical is going to have.&nbsp; Moreover, the effects of a chemical are not always immediately obvious, and the latency effect can sometimes lead to new problems down the road requiring a different set of solutions.&nbsp; With mechanical cleaning the effects are immediately observable and if satisfactory do not need repetition.&nbsp; But mechanical cleaning is limited to the removal of encrustations, adhesions and similar surface obstructions.&nbsp; </p><p><br /></p><p>In the end, what you see is what you are going to get, and in cleaning coins I can see more with a mechanical approach than by rolling the dice on chemicals.&nbsp; Beyond that the risk to which you alluded is minimized by clear sight and a steady (trained) hand.&nbsp; I recommend to numismatists to learn the skill and stop rolling the dice on their inexact understanding of chemistry.&nbsp; Cutting corners is not responsible conservation.[/QUOTE]</p><p><br /></p>

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