Question, house built 1982, "m" type copper water pipe, allowed back then, not now. The whole water pipe length from meter to to fixture supplies is covered with this blue color, does not come off in the hands. Only on cold water not boiler or hot water. does not appear to be corrosion, plumbing inspector says its electrolysis? Has anyone seen this before? problem or just cosmetic? Your help with this would be appreciated, as i did search the forums. It is not a flux problem.On town water, plastic feed to rust.jpgblue pipe3.jpg

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