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@Utter_Bawbag
Yup, this.
I used to build guitar pedals, and put copper plates on the top with the control legend / pedal name stamped on them. People used to ask how I got a beautiful verdigris on those copper plates.
I'd just say "Well, I stamped them, threw them in a bucket, then pissed in the bucket and left it for 24 hours."
So I've heard, roofers who work with copper do the same thing after completion.