The earliest instance of Creamware dates back prior to 1740. It is a refined, lead-glazed earthenware that is cream in colour, hence its name. These elegant wares were produced using white clays from Devonshire and Dorset, as well as calcinated flint, and fired at a lower than usual temperatures. In 1765, Josiah Wedgwood formulated a new technique to produce Creamware which included adding cobalt to the lead over-glaze. This lightened the cream colour to a blue-ish white, which Wedgwood sold as "Pearl Ware". After selling his Pearl Ware to both Queen Charlotte and Catherine the Great, Wedgwood received permission to rename it Queensware.