We chose a Dulux colour to start with. I chose red, and began shifting it with four methods. The first; mixing another primary colour into it; yellow, to make orange. The second was to dull it by adding its opposing colour in the colour wheel, so I began adding various amounts of blue and recording each shade. The third was to add white, which Marianne noted is how you can see which colours you've used to make your new colour. The final method was to dirty the existing colour with Van Dyke Brown.