Maiolica Process

To make "biscotto" terracotta, the clay artefact is dried and fired at 980 °C (biscuit). Majolica is made by throwing or moulding clay into the desired shape and drying it before firing it in a kiln at 980 °C. "Bisque firing" hardens the clay and removes moisture, making it more stable for glazing and decoration.

 

Today, Clay can be shaped using three main methods: turning, pressing in a mold, and casting.

 

1. Lathe Shaping (Turning):
Clay is shaped on a lathe, traditionally powered by a foot pedal, now electric. The potter centers a ball of clay, gradually shaping it into a desired form by hand while the wheel spins. After drying, the object is refined, burrs are removed, and additional elements like handles or decorations are attached with slip. The piece is air-dried (not in sunlight) until it is ready for firing.

 

2. Pressing in a Mold:
This manual process involves pressing clay into plaster molds with the negative shape of the object. Starting from the center, the clay is shaped outward using the fingers. Once removed from the mold, the piece is air-dried and treated like a turned object before firing.

 

3. Casting:
For intricate shapes like figurines or candlesticks, liquid clay is poured into a closed plaster mold. The mold absorbs the water, creating a clay thickness that forms the object. After drying and refinement, the piece is fired at around 980°C, resulting in a durable ceramic known as "biscuit."

 

Each method highlights the skill and craftsmanship behind Castelli ceramics, transforming raw clay into art.