How to mix watercolour - book from 1682
In 1692 an artist known only as “A. Boogert” sat down to write a book in Dutch about mixing watercolors. Not only would he begin the book with a bit about the use of color in painting, but would go on to explain how to create certain hues and change the tone by adding one, two, or three parts of water. The premise sounds simple enough, but the final product is almost unfathomable in its detail and scope.
More details at http://www.thisiscolossal.com/2014/05/color-book/.