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I am looking for a transparent (visual wavelength: 390 to 750 nm), non-magnetic (not attracted by a magnet) electrical conductor that could be used for a physics demonstration. Is there such a substance? If yes, is there a cheap one?

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A tank of water for ac current or a tank of water+salt for dc current would do the job.

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indium-tin oxide (ITO), through which you are reading this text quite now ( )

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