I am reading this book "Color" by the Journalist Victoria Finlay.
Victoria travels the world trying to find an answer in where the paints, dyes and varnishes comes from. Starting from Ochre found in Australia, to Central America, Scotland, Egypt, Spain, India and so on. She surprises the reader in the chemical processes in which insects, mummies, porcelain and other sources where paint comes from.
My favorite Color until now (in terms of Interesting) is the color YELLOW. Coming from bulls who would eat Mango Leaves to Saffron, which Cleopatra and other people believes to be afrodisiac.