JMW Turner is one of the greatest artists Britain has ever produced. His watercolours, with their extraordinary effects of shifting light and dramatic skyscapes, are especially highly regarded. For the first time, the secrets of Turner's technique are revealed, allowing present-day watercolourists to learn from his achievements.This book combines unrivalled knowledge of Turner's working methods from Tate curators and conservators with practical advice from some of the world's most respected watercolour experts. Twenty-two thematic exercises are illustrated with Turner's works. Expert contemporary watercolourists explain, step-by-step, how to paint a similar composition, learning from Turner's techniques. Packed with invaluable information, from the materials Turner used to achieve the masterpieces we know and love today, to the modern materials the twenty-first-century watercolour artist will need.Backed by the authority of Tate, the world centre for Turner scholarship, with a glossary of technical terms, this is an invaluable resource both for lovers of Turner's art and of watercolour painting.