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A couple of additional thoughts...

...While I have no reason to doubt your findings regarding ty-wrap color and RF lossiness, I'd be cautious about attributing the differences noted solely to carbon black content. In the polymer world, UV resistance is usually imparted by a system of specific UV absorbing organic compounds AND pigments. I have no idea what the composition of those black ty-wraps was but I wouldn't be surprised if there was considerably more than simple carbon black in there.

I also wonder if there are insulation colors other than black that might be every bit as "bad" as carbon black. Many stable pigments are based on metallic compounds.

Overall, the issue of insulation color in an audio context seems to be loaded with a lot of partial knowledge combined with the power of suggestion...IMO, of course.



Edits: 05/02/12

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