Originally Posted by goldpaninut
Any brushing on a valuable coin, even with a soft brass brush, will literally destroy their resale value. I'm afraid I have to agree with swinglow, you have ruined these coins and I hope no one else tries this with their valuable finds.
+1 I'm a lifelong coin collector and I agree. If you are doing it to please yourself, and don't care about the ending value of the coin, it is your property to do with as you wish. The 1909 Indian cent was the color and toning that it should be for its age and condition. Stripping the patina makes it undesirable for a coin collector, as the result is an unnatural color + scratches. I'm Posting only to make you aware of the consequences of this process on collectible coins. Seriously, you can have a $500 dollar coin and polish it into a coin having only bullion value. This does not apply so much to very worn or corroded coins, as they are collectible more as relics than rare coins. My 2cents.