These are details of some possibly 100 year old water mains just after they were dug up in Amsterdam. The patina on these things was just incredible. A deep black / gold glowing sheen. Now, after have been left exposed to the elements, they are just rusty...
Actually, these print scans don't do enough justice to it, the original A4 prints just glow...
Of your three shots Marco, this one appeals to me most. The view taken on the other shots made them slightly confusing. Are you sure these water mains are 100 years old, they appear to be black bolts holding the connections together, whereas I would have expected to see rivet connections.