Be careful, once contaminated will ruin other coins
I'm not sure which coin I cleaned that contaminated by jar (probably a really dirty penny - actual dirt rather than tone) but after that the silver coins I cleaned started getting brown spots after several days. Its also important to thoroughly rinse the coin in running water after dipping (don't just dip it in water) then dip it in deionized water and let it dry. I want to find some kind of holder I can snap a coin into then dip so that when drying neither side is actually touching anything. Paper towels are rough and can scratch proof coins' mirrored fields. If you have a lot of coins to clean or even just a few very valuable coins I suggest getting the gallon sized container so that you can use new cleaner for each coin and aren't risking contamination. Use gloves and be sure to tightly close the jar. When left in my hot car it leaked even though the jar remained upright and crystals formed all around the lid (maybe that's what ruined my jar rather than contamination?).<br /><br />When in doubt, don't clean your coin, let the pros at PCGS/ANACS/NGC/IGC do the conservation work.
Rating: 4 stars