If you really want to learn about colour and understand it better when looking at paintings or making your own, this is, as far as I (as a trained artist and teacher)know, the state of the art book on colour to work from. It is expensive (though considerably less so than in bookshops), but the quality of the printing is extraordinary; the colours and the images are exceptionally accurate.
I am so pleased with my purchase (which was very carefully made because of the price), I cannot emphasise it enough nor recommend it more highly.