page_title: Toning (coin)
hierarchical_section_title: Toning (coin)
caption_attribution_description: English: The reverse of an 1899 Morgan Silver Dollar. The coin in the photo exhibits peripheral rainbow toning.
context_page_description: Toning on a coin is the change of colour brought about through oxidization, which forms a thin layer of tarnish on the metal's surface. Coin toning can vary in aesthetics, and thus can alternately add or detract from a coin's value. Coins with unusual toning colours or patterns tend to be valued by coin collectors.
context_section_description: Toning on a coin is the change of colour brought about through oxidization, which forms a thin layer of tarnish on the metal's surface. Coin toning can vary in aesthetics, and thus can alternately add or detract from a coin's value. Coins with unusual toning colours or patterns tend to be valued by coin collectors.
caption: A Morgan dollar with iridescent toning
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