# Why aren't superconductors shiny? [duplicate]

Superconductors are really good at conducting electricity. Should they not reflect light very well too?

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## marked as duplicate by Chris White, Dilaton, Qmechanic♦Jul 23 '13 at 16:38

Super inductors are really good at conducting DC electricity. –  Johannes Jul 22 '13 at 17:41
Welcome to SE.physics. Before asking a question, better to check if it has not been answered. This question is the exact analogue of this one: physics.stackexchange.com/q/2409/16689 where it is discussed that superconductors are really good mirror for wave-energy below the superconducting gap. –  FraSchelle Jul 22 '13 at 19:05

For tin far below the critical temperature, this frequency is roughly 2.7 $\times 10^{11}$ Hz according to BCS theory, which corresponds to a wavelength of about a millimeter, much longer than the wavelength of visible light.