Does tarnish, scratches or dents affect the value of my bullion? Should I clean it?

Never clean bullion if you are unsure of its value. Tarnish is only a natural reaction to oxygen and sulfur on the bullion itself. Blemishes such as tarnish, scratches, dents, and milk spots often happen in the minting process or during handling. Any reputable dealer will know that these blemishes do not affect the value of the bullion, as the value of bullion is based on the weight and purity of the metal.