Toning means the coin is getting tarnished from exposure to the air. It has a little brown or gray on the surface. It is not necessary to clean it. Some collectors like coins with natural toning. To keep a coin from toning, keep it out of the air.
Depending on the nature of the toning, it may actually increase a coin's value. A particularly impressive color (blue, pink) or combination of colors is highly prized.
Toning is an alteration of the chemical makeup and color of a coin's surface. It takes place naturally over time as the metal reacts with chemicals in its environment. Rainbow toning is a term used to describe a coin that has hues ranging from bright blue to deep magenta to bright orange and light gold.
Silver (and to a lesser extent copper) tones when exposed to certain chemicals. When coins are left sitting in rolls or bags for many years, the chemicals cause the coin to tone, or change colour. Occasionally what happens is that it creates multiple colours that looks like a rainbow. Attractive toning is desirable to many collectors. However, one needs to be aware that toning can be faked fairly easily, so I personally would never pay extra for a rainbow toned coin unless it was sold in a reputable coin shop and graded by a reputable third party which detects artificial toning and will either note that it is artificially toned or refuse to slab the coin.
Like the oxidization or "rusting" that happens to other metals such as iron, toning of Morgan dollars is the result of a chemical reaction between the oxygen present in atmospheric air and the metallic content of the coin. Typically, toning produces a coloring to silver coins that, when the conditions are right, is usually composed of shades of gold, blue and yellow. But sometimes toning is caused by chemical cleaning and also how and what the coin is stored in.
The best way to artificially tone a coin is not to try. While natural toning is valued by many collectors, anything intentionally done using heat, chemicals, etc. will reduce a coin's value.
Can you? Yes. Should you? Probably not - you'll remove toning (which many collectors like) and likely scratch the coin's surface.
It's called toning and is a form of tarnish that occurs when the coin reacts with oxygen (and some pollutants) in air. Toning is prized by many collectors because it can be quite beautiful and is never the same on any two coins, so don't attempt to remove it.
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These exercises are toning my abdominal muscles.
The marine workout obviously. A workout marines do is effective for toning because that is why they do it. For toning, and stuff. Inquire a marine directly.
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Electric massagers usually work for toning muscles