this post was submitted on 03 Jan 2024
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[โ€“] kometes@lemmy.world 1 points 10 months ago (1 children)

Copper carbonate -- it is greenish. The white stuff in the front is paint, I think.

[โ€“] ikidd@lemmy.world 1 points 10 months ago

It'll pick up some copper oxidation on brass fittings.