Bloody hell!

Relatively recent instant blood preservation or 30 million year old blood preserved so incredibly well that scientists suggest it looks like it was prepared today for laboratory analysis?

fossils blood fossils preservationTwo monkeys grooming each other about 20-30 million years ago may have helped produce a remarkable new find - the first fossilized red blood cells from a mammal, preserved so perfectly in amber that they appear to have been prepared for display in a laboratory ... "These two tiny holes indicate that something picked a tick off the mammal it was feeding on, puncturing it in the process and dropping it immediately into tree sap,"

Part of what makes these fossils unique, Poinar said, is the clarity by which the parasites and blood cells are preserved, almost as if they had been stained and otherwise treated in a laboratory for inspection. The parasites were different enough in texture and density to stand out clearly within the red blood cells during the natural embalming process for which amber is famous.
Monkey business produces rare preserved blood in amber fossils | Phys org

Thanks to SIS news for mentioning the source article.