The processes for underglaze and overglaze decoration were very different. Most pieces use only one of underglaze or overglaze painting. These were freely painted with scenes in underglaze blue. Underglaze and overglaze decoration of many types can be used. The onion pattern was designed as a white ware decorated with cobalt blue underglaze pattern. Porcelain only painted in underglaze blue is traditionally called Arita ware. This technique was introduced for both underglaze and overglaze transfer in Worcester in the mid-1750s. The perfecting of underglaze transfer printing is widely credited to Josiah Spode the first. In modern times a wider range of underglaze colours are available. There were two main methods, underglaze printing and overglaze. During the early period wares decorated with Chinese-inspired scenes in underglaze blue were produced. For these she used on-glaze enamel colours, which enabled a brighter palette than underglaze colours. As a rule, the vases were covered by underglaze decor. Under the Yuan dynasty the use of underglaze cobalt blue decoration became popular. By around 1760 there was some underglaze printing in blue.