THE PRODUCTION PROCESS
The readily white-baked earthenware is being painted with very fine brushes and cobalt oxide. The painted pottery is then glazed. This takes place by immersing the object in liquid enamel, or by spraying the product with a compressor. Most products are being immersed, whereas for instance tiles are being sprayed. During the second firing process, executed in a kiln reaching a temperature of 1040°C (1904 °F), the enamel melts into a transparent glass-like layer and the black paint underneath the surface turns into blue. After a meticulous quality control, the object is ready for its presentation in the store.
The characteristic and traditional blue colour of Delftware is most famous and renowned. However, Delft is also known for coloured earthenware, which is normally referred to us Delfts polychrome. In this case the painting is set in blue cobalt oxide, and then coloured with different colours. The colours do not necessarily change during the firing process, although they are intensified by the enamel layer.
The craftsmanship of the Delftware painters is developed during several years of education and experience. The painters are trained by a master painter who taught them the traditional decorative Delftware motives and patterns.