Pure pigments are mixed with natural gum arabic to make these potently saturated watercolour paints. The colours are strong and clear with great mixability. If you choose the "with magnet" option, a tiny (but strong) magnet comes fixed to the base of the pan. When ordering extra watercolours to use in your Sketching tin, please select the "without magnet" option on the half pan listing. This will enable the pan to fit in the holder inside the tin.