silver
noun
a white, ductile metallic element, used for making mirrors, coins, ornaments, table utensils, photographic chemicals, conductors, etc. Ag; 107.870; 47; 10.5 at 20°C.
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In consequence, the possessor of such a telescope, if he wishes to keep it in order, must always be prepared to resilver and repolish it.
From Side-Lights on Astronomy and Kindred Fields of Popular Science by Simon Newcomb