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If I strip an insulated wire, and the wire under the insulation is dark, not bright, and it's this way not just at the end but in the middle too, should I discard that wire for use? Has it been damaged from too high resistance?

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    Dark as in just dark, or dark as in corroded? Wires aren't damaged by resistance, but by heat melting the sheathing. Got a picture? – Machavity Sep 28 '17 at 17:38
  • What Machavity said plus copper oxidizes and turns dark. It could have oxidized during manufacture or later. Usually not a problem unless you are trying to solder it. – ArchonOSX Sep 28 '17 at 17:50
  • oxidation may indicate its been exposed to moisture. To a certain degree you can still use it if you take care to remove the oxidation at any connection. That said there are all kinds o fwire and applications, its hard to be generic. – agentp Sep 29 '17 at 0:10
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It can oxidize, but if you can test it for connectivity it should be fine.

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