The technique is currently under debate. Some researchers claim that this type of ceramic must have been produced using the "sgraffito" technique. This consists in the application of two layers of angobo (ceramic paste used for finishing pottery pieces) of different colors on the pot, and scratching the upper layer so that the bottom layer becomes visible through the scratches. The craft made of clay, in the blooming state, was given with a white angobe, after which another blue angobo was applied. After drying the second layer, the decorative pattern would be engraved, so that the white layer beneath would have appeared on the surface. It would be followed by gilding with a transparent, colorless enamel and, at the end, the bowl would be burned. Other researches have developed a new theory, according to which it is not the "sgraffito" but the "batik" technique that creates the desired effect. "Batik" means drawing the ornaments with fluid, hot beeswax and then covering the whole pot with blue enamel. The enamel does not adhere to the parts where beeswax had been applied, and so the patterns keep the color of the base. Although the method of making the Saschiz blue ceramic decoration is a controversial topic, it is distinguished by the perfect shape and processing technique at a level rarely reached. After 1815 these pieces, of special value, were imitated, but without reaching the original artistic standard of the pottery makers *.