Codewise-speaking, you can mark a white wire black, but not vice-versa.
It'd be better if the wire was already black and white. It might be.
Doh! Don't know what I was thinking, I've never seen any cable with just
black and red wires. One is always white, as far as I've ever seen anyway.
Anyway, thanks for the code pointer, I wasn't aware of that.
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