Products  >  Paints  >  Watercolour 37ml  >  Sets of 12 Full set of 12 Principal Colours (37ml) Although a huge range of colours (most pre-mixed), are available on the market, it is difficult to find any outside of these twelve which have a serious application in colour mixing. Colours may also be ordered separately. Our Price: £117.40 (List Price: £143.90) Quantity: