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The definition of a metal includes the fact that it is shiny when freshly cut. Metals that readily oxidise would therefore have a dull appearance as a layer of that metal's oxide would quickly form on the outside. Such metals include Zinc, Magnesium and Lead.

Any metal that has been left to oxidise for a long time would be dull, so copper or even silver, for example, could also be dull.

Unreactive metals are rarely ever dull. Thus Gold and Platinum are examples of metals that are almost never dull.

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