>>95938224
Army Painter verdigris has a little tiny bit of texture beads in it if you're looking for that. Dirty Down Verdigris is a little too stain-y, if you don't use a thick coat of it, all it's going to do is stain the copper a dark, dark blue.
I used Army Painter Verdigris, heavily watered down to a wash consistency, and then dabbed it into some recesses or on top of rivets. I liked how it came out.
Post your necrons when they're painted, I hope I get to see it.