More of a melt coin. Too much damage to be a keeper. The color was probably from sulfur in the air of its environment. That plus tarnish of the silver in the nickel.
Using acetone is like following a trouble-shooting process on a stained/crud-encased coin. If it works, that narrows the issue (eliminates some possibilities). If it doesn't work, then that narrows the issue (suggesting other possibilities).
Disclaimer: While a tremendous amount of effort goes into ensuring the accuracy of the information contained in this site, Coin Community assumes no liability for errors. Copyright 2005 - 2026 Coin Community Family- all rights reserved worldwide. Use of any images or content on this website without prior written permission of Coin Community or the original lender is strictly prohibited. Contact Us | Advertise Here | Privacy Policy / Terms of Use