Bisque firing is the first firing that takes place on ceramic pieces, generally at temperatures between 850°C and 1000°C. At this stage, the raw clay is transformed into a rigid but still porous material, known as "bisque", which is ideal for absorbing glazes, engobes or decorations in the later stages of the ceramic process.
This process is essential to completely eliminate residual water and organic compounds present in the clay. It also stabilizes the piece and significantly reduces the risk of fractures, deformations or explosions during glazing and final firing. Bisque-fired pieces are also more resistant than raw clay, which makes them easier to handle for additional decorations or surface corrections.
For example, a bisque cup can be dipped in liquid glaze and retain it due to its porosity, ensuring uniform application. This property makes bisque firing an essential step in the preparation of functional and decorative pieces, ensuring that they are ready for final firing without compromising their integrity.
Interesting Fact
Bisque firing is used in most ceramic techniques, but there are some, such as single firing, where the glaze and clay are fired at the same time, eliminating this first firing.
Helpful Tip
Allow the pieces to cool completely in the kiln after firing before removing them, as sudden cooling may cause cracking.
