The processes for underglaze and overglaze decoration were very different. Most pieces use only one of underglaze or overglaze painting. A different type of paint is used from that used for overglaze painting. The amount of colourful overglaze decoration used on them also increased. Eventually this would mainly use the Cizhou invention of overglaze enamelling. Underglaze and overglaze decoration of many types can be used. There were two main methods, underglaze printing and overglaze. Pieces with overglaze painting are often referred to as "enamelled". This combined underglaze blue outlines with overglaze enamels in further colours. With overglaze printing only a low-temperature firing was needed. Both factories made mostly tablewares that had elaborate overglaze decoration, mostly with floral subjects. This technique was introduced for both underglaze and overglaze transfer in Worcester in the mid-1750s. A third firing at a lower temperature may be required to fix overglaze decoration. Decoration applied on top of a layer of glaze is referred to as overglaze. For overglaze printing, an engraved copper plate was prepared and rubbed with oil.