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<p>[QUOTE=&quot;lrbguy, post: 3070325, member: 88829&quot;]Not at the sacrifice of patina.&nbsp; Patina is not a coating.&nbsp; It is a conversion of coin metal at the surface into a non-metallic salt.&nbsp; This protects the deeper metal from deterioration on exposue,but tends to fuse with whatever material surrounds the coin while in the ground.&nbsp; In cleaning you need to learn how to separate the encrustation from the patina.&nbsp; When you sacrifice patina, you are losing some of the original coin metal, and it cannot be replaced.&nbsp; Thereafter the coin is damaged.</p><p><br /></p><p>It is not an exaggeration to say that the patina is the lower limit for cleaning.&nbsp; The only exception is when the coin has damage or chemical activity at levels deeper than the patina.&nbsp; If you are new at this, you are probably not yet ready to deal with that.&nbsp; All in good time.&nbsp; But treasure the patina.[/QUOTE]</p><p><br /></p>

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