and gold. Fill a bowl with hydrogen peroxide. Submerge coins and let them soak for up to 24 hours. Rinse and dry thoroughly with a soft towel. Do you know how to clean coins that have turned black?

Here are four ways to check if your coin can be sold for almost $14,000, according to financial review site Tododisca. The coins on the market that are currently going for around $13,500 have ...