Firing atmosphere
The firing atmosphere refers to the gaseous environment inside the kiln during the firing process of clay pieces. This atmosphere can be oxidizing, reducing or neutral, and each has a different influence on the final result of the ceramic piece. In an oxidizing atmosphere, there is an abundance of oxygen which facilitates the complete combustion of organic materials and produces brighter and more consistent colors in the glazes. On the other hand, a reducing atmosphere limits the amount of oxygen available, which can cause changes in the colors and textures of the glazes, creating deeper and richer effects. The neutral atmosphere maintains a balance between oxidation and reduction, providing intermediate results.
In addition to affecting aesthetics, the firing atmosphere also influences the physical properties of the ceramic, such as strength, durability and impermeability. Controlling the atmosphere is crucial to avoid defects such as cracks, explosions or unexpected changes in the color and texture of the pieces. Ceramists must understand how different atmospheres interact with the materials they use to achieve the desired effects and maintain consistency in their productions. Choosing the right atmosphere depends on the type of clay, the glazes used and the artistic style to be achieved.Interesting Fact
In traditional techniques such as Japanese raku, the firing atmosphere is rapidly modified by the addition of combustible materials, creating unique color and texture effects on the pieces. This method requires expert kiln management to achieve the desired results, as small variations in airflow and fuel quantity can produce significant differences in the finish of the pieces.Helpful Tip
To control the firing atmosphere, adjust the amount of oxygen entering the kiln by regulating the air inlets and ventilation. Test small pieces to see how different atmospheres affect your glazes.
