Message:

<p>[QUOTE=&quot;Colonialjohn, post: 7637123, member: 57741&quot;]Another cleaning coin thread in Coin Talk. I have been experimenting recently with ultrasonic cleaning and hydrogen peroxide. A small portable ultrasonic unit costs around $50. Add one cup of water and 4 tablespoons of hydrogen peroxide. My machine does 4 minute cleaning cycles. Test your local tap water on a new Lincoln Cent and determine if YOUR water hardness has any ill effects on the patina (i.e, copper over Zn core). Mine does not. If it does you must use distilled water. Period. I normally do ultrasonic cleaning first for well soiled coins below AU. Buy a camel brush and use this in the rinsing step. Once the loose particles are removed which may impose hairline scratches use your solvent of choice remembering they have little effect on removing copper oxides and no effect on silver oxide removal. Luckily I have a quantity of Freon TF saved from the early days. NOTHING cleans copper BETTER than Freon TF which USEPA has banned for many years. Study your soil removal task. If its metal oxide discoloration try ultrasonic cleaning then the camel brushing step afterwards. Clean only when necessary. Never clean Mint Red coins or Proof coins. You can try what I call the Tom Reynolds copper cleaning method. Immerse the copper coin in xylene minimally for a month. Use a toothpick to DISLODGE the particles in and around the coin&#039;s motif. Repeat as necessary. Some processes require 6 months to a year in a glass jar of xylene (xylem). Feel free to send me photos for my suggestions. OK ... you can continue now to talk in circles on what is better - acetone or xylene. LOL</p><p><br /></p><p>John Lorenzo</p><p>Numismatist</p><p>United States[/QUOTE]</p><p><br /></p>

Your name or email address:

Do you already have an account?

• No, create an account now.
• Yes, my password is:
• Forgot your password?

Stay logged in