The Alchemy of Blue: Unraveling the Science, History, and Art of How to Make a Color Blue
The first time humans learned how to make a color blue, they unlocked a secret that would define civilizations. For millennia, the hue was so rare and labor-intensive that it became a status symbol, a divine marker, and even a currency. Ancient Egyptians ground lapis lazuli into powder, trading it like gold; medieval Europeans guarded […]