Finally, we are ready to fire our first artifact. It would be placed in a gas or electric oven (at one time they used a wood-burning fire). After the first firing, (which reaches 1040°C), the vase is at the “Biscotto” or “Biscuit” stage. At this time, it will be rosy in color, consistent in structure, and porous (if made with red clay). Taken out of the oven, then it is decorated and put back into the oven for a second time at a temperature of 920-940°C.
It may seem easy, but this operation requires great ability by the potter, especially in depositing the right harmonious quantity of Glaze on the entire surface. To avoid inaccuracy reoccurring in the design, often is used an antique technique of dusting. By using a piece of translucent paper pierced with a needle along its edges, it multiplies what is on the surface of the vase and then is beaten with a wad of fabric containing coal powder. Thus, falling through the holes in the paper, it deposits on the surface, outlining the edges of the design to which colors are applicated.
The traces of carbon powder left is revised by the painter with a brush, and therefore is always applied with a paint brush. Colors are applied to complete the design. The special colors of ceramic are obtained with diverse metallic oxides, earth, and minerals. A green shade is produced with the oxide of copper, yellow with oxides of iron, while the oxide of cobalt produces blues and the oxide of manganese produces browns. The colors and enamels must be firing to obtain consistence and brilliance therefore, the vases are firing again for a second time, according to “its beauty” around 920-940°C.
“foto pezzo cotto”