ransley wrote:
How do you get new copper to look naturaly aged green and stable,
Verdigris. I have used acids Hydrochloric, Hydroflouric, and find the
Verdigris is a top layer and sometimes bluer or darker green than
naturaly aged copper.

snip

I understand that urine works quite well. I heard a tale once -
possibly apocryphal - of a university piping the urinals from the gents
onto a copper dome...

Andy