I love this book! I've read it, recommended it to friends, and pull it out when I need a short break. It's "Color: A Natural History of the Palette" by Victoria Finlay.
Organized into chapters based on color, Finlay researches and travels around the world to track down the sources and mysteries around the production of color throughout history. Whether she is tracking down lapis lazurli in Afghanistan, or sharing anecdotal stories about Mr. Windsor and Mr. Newton, it's an enjoyable, informative read.
Sometimes on a beautiful summer day, I just need to go read a book in the park! If you're reading in your studio, you might want to set a timer. Enjoy!