LOL!
The history of blue pigment is almost certainly the most fascinating story of any pigment. Subject of many academic studies and non-fiction books, a part of art history. Even a key element in one of Christopher Moore's warped books, Sacre Bleu: A Comedy d'Art (combine (a) the death of Vincent van Gogh, (b) ribald fact-based fiction about the French Impressionists, (c) the sacredness, scarcity, and history of blue pigment, (d) evil incarnate, and (e) all the warped comedy Christopher Moore can bring).
No blue at Lascaux.
The Virgin Mary's blue mantle (431?), and 10th and 14th red mantle (not at all well-versed here). IIRC, unfinished Renaissance portraits of the Virgin Mary because of the unavailability and cost of ultramarine blue. Blue in an atom of a nutshell: Blue Through the Centuries: Sacred and Sought After.
I read a lot on the subject (Google: history of blue pigment) about two years ago, including parts of art and pigment history books, but I'm an infant on the subject Blue. It's fascinating.