Copper pipe corrosion.

I’m looking for some verbiage to describe this copper water heater line that is not wet and does not leak but the buyer was overly concerned by the green corrosion. California home.

It probable is/was leaking somewhere.

Looks like a leak at the soldered copper fitting due to the flex copper tubing connector being over torqued-without supporting the fitting when installed.

Pin hole leak…past or present. Best to repair it now.

Well at least the buyer was concerned. :roll: