Emiliano Geant narrates A Brief History of the Color Blue, a chapter from Yanko Tsvetkov’s upcoming book Atlas of Color. Our journey will take you from the Kokcha Valley in Northeastern Afghanistan—the source of the precious ultramarine pigment, all the way to Huaca Puerta in Peru, where 6000 years ago people began using indigo to dye textile. You will also find out whether blue roses exist and how looking for an universal cure, an alchemist discovered the first affordable blue pigment in history.