When copper conductors or wire overheat slowly due to slightly excessive current flow, the color of the copper first takes on a deeper reddish color. If the overheating is continuous that color tends to stabilize and remain constant. If the circuit is disconnected and allowed to remain unused for a period of time, the copper takes on the usual green color for copper oxide.
What causes that reddish color? Is that a different oxide? Any other potentially useful information would be appreciated.
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