We have just received these sets of QoR Watercolours and boy are we impressed! Deep, rich, vibrant colour providing intensity and clarity while retaining the best qualities of traditional watercolours. The exceptional colour strength of QoR Watercolour is achieved through the use of a unique binder called Aquazol®, which is highly soluble in water and remains resoluble over time. It remains stable after accelerated light aging tests with no significant change in colour, and is safe to work with. Aquazol® holds much greater amounts of pigment than the same amount of gum Arabic, while retaining a strong and flexible paint film. This new binder retains the blending, glazing and lifting properties important to a quality watercolour. You have got to get your hands on a set of these!