Wrapping power cords and interconnects with copper foil.

...and here I thought I’d be in intelligent company.....*ROTFLMAO*

(If you’d get that last bit...ask the Goog....speaking of education of recent ’web history’....)

BTW... Copper oxidizes to black if uncoated.... 

"Foiled again!" only one vowel from the Who's howl.in the song that remains the same...;)

I'm going to try this on my cats tail.if he quits getting the zooming i will know it works.enjoy the music and experiments cuz it stimulates the brain .that foil did not cost that much.there are some manufactured cords with triple shielding .shunyata uses air as they think it's best insulated.kimber uses carbon.there is not one that rules them all.

https://forum.psaudio.com/t/shielding-for-power-cords/37521/4

I can't speak for cables or interconnects but I had a noise issue with a tube preamp that regular Tin foil cured. 

I had hooked up an older tube preamp in my living room about a year ago. Right next to the TV..a couple feet away from a modem & router as well. The pre was putting a lot of noise in the chain. I switched out the tubes thinking they might have gone extremely microphonic sitting in the garage unused for over a year. 

New tubes made no difference. As I was jiggling & checking the rca inputs/outputs I noticed a change in the noise. Went into the kitchen and ripped off a square of Reynolds Wrap tin foil. Laid it over the back of the preamp & all the noise went away. Like wow. Obviously it looked pretty silly so I moved the preamp into the spare bedroom system which has no digital or wifi products. No issues in that room with that preamp & noise. In the living room  that little piece of thick aluminum foil was definitely blocking some intrusive noise wavelengths. 

Reminds me of the movie "Signs".