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<p>[QUOTE=&quot;LRB, post: 2602488, member: 83748&quot;]The problem with desert patina is that the chances of buying a coin with genuine sand deposits is slim nowadays as rogue sellers know that an applied patina will make a sows ear look like a silk purse, so they spray a mist of glue on the coin and drop it in very fine sand. Later they whiz it with a dremel and nylon attachment to remove sand until the detail is visible.&nbsp;&nbsp; I&#039;ll bet you wouldn&#039;t spot the difference between genuine and applied.</p><p>In answer to the OP question, </p><p>Only by removing some of the dark patina will you lighten the coin.&nbsp; Acid or alkaline,&nbsp; or use something mechanical and abrasive. </p><p>Dark is a natural patina for many find spots...</p><p>In pasture here in the UK,&nbsp; I detect them and they are black in colour ..</p><p>Light them differently for photography or display using a cool lamp maybe?[/QUOTE]</p><p><br /></p>

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