Cotman Watercolours are a range of 40 colours which have been selected to offer a wide colour spectrum, suitable for amateur and accomplished artists who require larger volumes of paint at an economical price. Pigments are chosen carefully, according to mass tone, undertone, colour strength and relative transparency to ensure the widest mixable range. The Cotman line is close to Winsor & Newton Artists' Watercolours in hue, enabling the use of both with minimal adjustment to technique. Both Cotman and Artists' Watercolours can be freely intermixed but attention should be given to permanence ratings for longevity.