Saw what was labeled simply as "blue severum" over 20 years ago in a shop in Cambridge, Massachusetts, USA. Very blue/turquoise, some individuals a fairly dark blue. Don't know where they came from, whether they were what I've seen called Heros sp. "Santarem Blue" or something else, but without special lighting they were equally to more blue compared with the Santarem Blue
on this page. Other photos I've seen of Santarem Blue have been kind of blue or hints of blue, but not like the one in the link and not like the several individuals I saw in person over 20 years ago.