The most apparent properties of metals, their luster and their color, have been known to mankind since metals are known. Because of these properties, metals were already used in ancient times for mirrors and jewelry. The color was utilized 4000 years ago by the ancient Chinese as a guide to determine the composition of the melt of copper alloys: the hue of a preliminary cast indicated whether the melt, from which bells or mirrors were to be made, already had the right tin content.
KeywordsGraphite Attenuation Refraction Flint Silver Gold
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