 One of the ceramic fluxes in ash glazes is calcium oxide, commonly known as quicklime, and most ash glazes are part of the lime glaze family, not all of which use ash.In some ash glazes extra lime was added to the ash, which may have been the case with Chinese Yue ware.A relatively high temperature of around 1170 °C is required, high enough to make the body into stoneware or (above about 1200 °C and with the right materials) porcelain.