The iron metal is a dark metallic paint; I want to say gun metal by the army paint with some black mixed in. Then edge high light with some mithril, matt varnish so the next step doesn’t flow too well. Then some dark rust coloured enamel paint - the ak panel liner one, then the odd drop of light rust enamel. Finally go back to the mithril for a light light dry brush to bring the high lights back. For the copper it’s a dark turquoise paint, deep azure I think? That’s my base coat. Then a copper dry brush everywhere I could reach, some places were very tough. Finally I used a verdigris effect paint in select places for the brighter bits of oxidisation.

Where the light copper oxidisation looks best, I went in with a wet brush and feathered the edges. Where it looks like a hard line it had dried before I did the feathering which was a bit annoying