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<p>[QUOTE=&quot;Oldhoopster, post: 7491879, member: 84179&quot;]No harm in practicing with a face value coin.&nbsp; </p><p><br /></p><p>Take a look at the coin after cleaning.&nbsp; Do you see the very light hairlines? Notice that color is slightly off and doesn&#039;t look natural?&nbsp; These are the the things that experienced collectors and TPGs can easily spot.&nbsp; And when they see it on a collectable coin, the value drops significantly.</p><p><br /></p><p>However, if you think you did a nice job and improved the coin, that&#039;s wrong.&nbsp; If you did this to a collectable coin in order to improve it, you would lose money (and ruin the coin for future collectors).&nbsp; That&#039;s why you hear &quot;DONT CLEAN COINS&quot;. If you have a good understand of chemistry and metallurgy, with practice, you might be able to pull it off occasionally, but for the average collector, cleaning coins is like washing your car with fine grit sandpaper.&nbsp; Not a good idea[/QUOTE]</p><p><br /></p>

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