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<p>[QUOTE=&quot;calcol, post: 5319693, member: 77639&quot;]Coins are cleaned successfully all the time.&nbsp; Whether and and how it should be done requires expertise.&nbsp; Every ancient coin has been cleaned at least once.&nbsp; Ultrasonic cleaners can be helpful in some circumstances, but they can ruin a coin in others.&nbsp; Some coins may have hidden cavities, and ultrasound waves may cause the fluid in the cavities to expand and fracture the coin.&nbsp;&nbsp; It takes knowledge and experience to clean coins regardless of the method.&nbsp; In the hands of inexperienced amateurs, it can be a disaster.</p><p><br /></p><p>Cal[/QUOTE]</p><p><br /></p>

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