I love this capped dime, but the mark really distracts me - does anyone have any suggestions on how to remove the yellow marks?
I don't know why people have to take the time to post sarcastic stuff like that. :rollling: I can't tell what it is that causes the yellow spot but a swish or soak or both in pure acetone and a swish in distilled water afterwards may remove it without harming the coin. Otherwise, I don't know what to try that won't alter the coins surface.
I would try acetone first, but it looks like there is a tiny darker locus in the middle of each yellow mark, which would indicate corrosion/toning ( yellow?) from a contaminant and might not be affected by the acetone. Then it is either: leaving as is, or try very diluted EZest for short dips/rinses to see if it comes off before most of the patina does.
If it was just tarnish. I would use hot water and cooking soda in a glass bowl, with a piece of albumin foil that has been sanded. Next place the coin just touching the foil. If the tarnish or object goes away, then remove the coin and pat it dry with a cotton cloth. Do not rub the coin. Let us know if it works well.:smile
Keep the albumin (egg protein) away from silver! Autocorrect doesn't know much about chemistry. On a more serious note, I don't believe the aluminum-foil-and-baking-soda method is very well thought of for valuable coins, either.
