FROM GETTY.EDU
A Paint More Precious Than Gold - How to Make Ultramarine Blue
There is a blue so exquisite, its hue so mesmerizing, that its use was reserved for only the most important of figures in the paintings of the Middle Ages. In this classic episode from The Getty Center's 'Becoming Artsy' video series, host Jessie tries her hand (and her hammer) at making the most expensive pigment in the world.
https://www.getty.edu/news/becoming-artsy-season-2-episode-4-ultramarine-blue/