The basic principle of this ingenious series is by now established. The cover includes a simple colour wheel and then the body of the text provides a series of eight demonstrations based around specific colour combinations. Neither of these things is original on its own, but the idea of putting them together is really quite inspired and provides a way in to what is for many a tricky subject.
The original watercolour volume used a trick paper that was supposed to mimic watercolour paper, not altogether successfully, but neither of its successors has gone down that path. However, the illustrations in both do seem rather dark, here to the point almost of murkiness and I do wonder whether there is a reproduction issue.
That aside, the series is a bold and largely successful attempt to provide a way through the maze that is colour mixing and is to be welcomed for that.