Barber pole
Hello,
Usually what you are describing is an artifact of the extrusion process, wherein one yarn was inadequately cleaned as it exited the extrusion die. The resulting corrosion is from particles of metal from the die. But I once saw a piece of 1x19 wire with one mild steel yarn, and 18 stainless ones. Oops. If you have actual, deep corrosion going on, it might be that the affected yarn is not good steel, and, as Brian says, the whole thing's gotta go.
Fair leads,
Brion Toss
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