These jugs are made of kaolin (a special kind of white, purified clay, a.k.a. the China Clay). They are fired at temperatures in the range of about 850°C to 900°C and glazed. The glaze proctects the drawings and the dye from outside effects such as oxygen, light, etc. For this reason, nothing happens to the vivid colors of the jugs even after centuries. The dye Turan Duru uses is a natural dye extracted from soil, which is not solved in the water and be able to last virtually forever.
Custom made jugs are also produced by Turan Duru.