The green and white encrustation is usually the result of water seepage leaks. The flux normally is burned off during the soldering process, and in any case I would check the joints for corrosion and deterioration of the copper tube.: I performed an inspection of a home that I am buying. The ABS is Gable. The house was built in 1988. Are there lot #s for the bad Gable pipe and where can I obtain them.: Additionally, the copper water pipe is green and white at every joint. Most of the copper pipe I have seen is fairly clean at the joints. Is it uncommon for the joints to patina. It looks as if it may be a result of the flux.: Thank you for the assistance.