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Or any other silver surface? Perfect silver "colour" just seems to be "reflecting gray", so something that absorbs all wavelengths by the same fraction and reflects everything else specularly. When I scratch it, it gets gray.

So a mirrors are gray and specular reflectors and therefore the colour we commonly call silver is, also, simply gray and specular. Is that correct or am I heading in the wrong direction here?

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Standard mirrors used to be made of silver and silver yes has a grey metallic color to it. Platinum can also be used to make a brighter less grey mirror. A Dielectric mirror reflects best almost all viable light and should have no tint of grey.

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    $\begingroup$ This says nothing about why mirrors and/or silver is gray. $\endgroup$ – Dmitry Brant Feb 10 '18 at 0:10

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