The introductory text, which makes up about a 1/3 of the book, is a solid overview of the history of color theory, leading the reader to what science has currently taught us about light and refraction. Totally easy to understand and follow - I recommend this for anyone interested in a basic understanding of how color works.
The remaining sections of the book deal specifically with brands of paints/art supplies with recipes for very specific colors. Pages and pages of charts with color swatches. This, to me, was overkill - while useful for a beginning artist, it could also become a crutch that prevented a painter from experimenting with their palette and reaching a better understanding of color on their own. Sort of like instead of learning a language before you travel to a foreign land, you choose to look things up in a dictionary.