5min chapter

SciShow Tangents cover image

Blue

SciShow Tangents

CHAPTER

The History of Blue Vivianite

Vivianite is a hydrated ferrous phosphate mineral that forms on wet dead things and turns blue when it touches air. It's been found on human remains in crusty patches or discolored blotches from the lungs and skin of the Iceman Utsi. Vivianite can both help and hinder research in different ways, which Sam thought was weird as he started digging into this.

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