You could easilly reverse the effects of wear by heating the wire untill it's cherry red but that will probably distroy the chrome plating on the crocadile clips.
Copper annealing is actually done at temperature's from 761°F to 950°F. Cherry red is 1652°F and a little to hot because its melting temp. is 1981°F.
These numbers are for pure copper and might be slightly different for copper wire.
Work hardening should not be a big deal. If one section of the wire gets hard it will just bend in a softer area. The wire should last long enough to be pratical. The wires can always be replaced..
Take a 4 or 5 inch bit of wire and hold it by the ends when you bend it. It is difficult to break because it does not always bend in the same place.
Copper annealing is actually done at temperature's from 761°F to 950°F. Cherry red is 1652°F and a little to hot because its melting temp. is 1981°F.
These numbers are for pure copper and might be slightly different for copper wire.