Winsor & Newton Cotman Watercolour Half Pan and Brush Pen SetWinsor & Newton Cotman Watercolour is quality watercolour paint at an excellent price. Popular with artists as well as students, hobbyists and crafters, it can be used on a variety of surfaces, but best results will be achieved on a good quality watercolour paper. This Half Pan and Brush Pen sets contain 12 Cotman Half Pans, which you activate by adding water to. The brush pen included can be filled with water to apply to the half pans. Wells within