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true that professor shellman, different rivers give different patinas, salt water does it blue andblack. Stjohns produces a bluish patina also, some rivers give reddish. We have a man made beach over here that has thrown up many a paleo point and various lithic debitage,lolAre you sure that's asphaltum?? The patina is so thick on that piece I can't see how "tar" would have remained......!?! Coral takes up a dark, often black patina in saltwater.......