These are 3 examples of the exercise we did today in my new watercolour class. When you paint with one colour as in these examples the only variable you have available to create a successful painting is value. In these examples even though they each use only one colour, that colour is actually made up of 2 colours. I did that only because I find these mixtures more interesting even though the exercise works just as well with one colour particularly if you use a darker value colour such as dioxazine purple or ultra blue.
The text is a little hard to read but if you click on the image you’ll see a larger version.