* Try to always hold the coin by its edges.
* Use cotton gloves to handle valuable coins to prevent fingerprints appearing on the coins.
* In general, coins should not be cleaned. Cleaning could potentially damage a coin. If a coin needs to be cleaned, take the coin to a professional.
* Do not use coin holders. They contain PVC which can give the coin a greenish tint after time.
Some coins were made specifically for collector's purposes and can be used to commemorate important