# PVC Wire Insulation

by jim hardy
Tags: insulation, wire
 Sci Advisor PF Gold P: 3,515 I might have arrived at a partial answer by blind luck. After more reading, the black stuff is more likely copper sulfide(? .. chemistry is not my strength. ) EDIT oops Aleph posted while I was typing THANKS !!! Adding just a few crystals of copper sulfate biocide from the farm supply store to my salt&vinegar solution turned the black stuff to a copper color, albeit a dull one. Rinsed it in baking soda then applied flux and it readily took solder . That has rescued a hundred dollar extension cord (200 ft #12) that only needed a new receptacle end. Total expenditure: $0.59 for receptacle$0.19 for outlet box had everything else on hand. I hope this helps somebody with a car , boat or household repair. Industry needs to know if PVC stabilizers are corroding the wires they insulate - it could cause something that's important to fail. old jim