The main pottery types of earthenware, stoneware and porcelain were all made in large quantities, and the Staffordshire industry was a major innovator in developing new varieties of ceramic bodies such as bone china and jasperware, as well as pioneering transfer printing and other glazing and decorating techniques.
[3] By the late 18th century North Staffordshire was the largest producer of ceramics in Britain, despite significant centres elsewhere, and relied heavily on child labor throughout the production process.
[citation needed] The boom came after the discovery in 1720 by potter John Astbury of Shelton, that by adding heated and ground flint powder to the local reddish clay he could create a more palatable white or Creamware.
[6] A group involving James Brindley later patented a water-based process that reduced the generation of fine siliceous dust, lessening workers' risk of developing silicosis.
[citation needed] Potteries active in the 19th century include Spode, Aynsley, Burleigh, Doulton, Dudson, Mintons, Moorcroft, Davenport, Twyford, and Wedgwood.