ljgerens
Many years ago people observed their Monster Speaker Cable turning green through the clear PVC jacket. This was due to dehydrohalogenation of the PVC jacket producing HCl which reacted with the copper conductor forming copper chloride.W-o-w! I never knew that! I used the original Monster Cable speaker cable in a biamplified Infinity 2.5 speaker system back in the very early '80s, so I had a lot of the stuff. It was a great sounding system but that is exactly what happened to the cable - I'd never seen anything like it before or since. The green color actually creeped me out a little and I threw the cable in the garbage.