Thought I'd toss out this new arrival for comment. It was cheap, seller ran a pretty dark photo, and so I was surprised by the garish blue patina. Or is it a patina? Maybe it was spray-painted. The surface feels pretty hard and stable (which is to say it hasn't turned my fingers blue). Just wondering if anybody out there has seen this kind of blue? The third photo shows it with a couple of other bronze/brass Romans for color comparison. I believe it is RIC 720a, Antoninus Pius sestertius with a "slow" quadriga reverse. It weighs 25.55 grams.