Had realtor ask me to evaluate a beach condo in Alabama with worries of possible Chinese Drywall after a gypsum sample was ruled inconclusive. Copper wires in every electrical receptacle were black, copper pipes above water heater were black, copper coils in HVAC unit were black, a clear lamp chord had black wires within. Rotten Egg smell was present. Since the unit was a condo, there was no where to evaluate the backside of any drywall.
My question is what would cause these symptoms other than Chinese Drywall?