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RE: OH yes...

It is plausible that insulation color and some variation of wire characteristic(s) might be correlated but that the color itself is not the actual cause of the variation.

One possibility is that in a wire mfg facility, a particular insulation extruder is dedicated to one or two similar colors to avoid the production inefficiencies assoc with changing colors. Since the dies are manufactured within some manufacturing tolerance, under these conditions, it's probable that any two dies for two extruders (colors) will produce insulation thickness slightly different from each other. This in turn might be expected to result in slight differences in measurable characteristics of say twisted pairs built up of wires from different extruders (colors). It's probably safe to assume that machine to machine production variation is monitored and controlled to the extent that measurable cable differences due to this variation is small and would become most apparent with long runs where differences would be magnified. If this type of dimensional production variation is a cause of variation of measurable cable charactetistics, it seems reasonable to expect correlation of cable characteristic to insulation specific color to be confined to specific production runs of a specific manufacturer. IOW, all else equal, black cable from mfg "A" might be closer to spec than red and white cable from mfg "B" might be closer to spec than their black.

For audio apps, color vs goodness is probably in the mind of the beholder.

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