Sovereignty Module: Command the Fire

Complete Kiln Atmosphere Control: From Oxidation to Reduction

Kiln atmosphere transforms glaze color and clay body. This campaign covers oxidation, reduction, neutral firing, and the science of atmospheric effects on ceramic chemistry.

Chapter 1: Atmosphere Types

Chapter 2: Controlling Atmosphere

Chapter 3: Reduction Firing Schedule

Chapter 4: Glaze Color by Atmosphere

Chapter 5: Wood Firing Atmosphere

Reference Card

1. Atmosphere is the potter's hidden variable (two identical pots with identical glaze, fired to the same temperature but in different atmospheres, will look completely different; atmosphere control is essential to predictable results). 2. Reduction steals oxygen from metal oxides (in a reduction atmosphere, carbon monoxide pulls oxygen from iron and copper oxides in the glaze, changing their color; this is the chemistry behind celadon green and copper red). 3. Oxidation is the default (an electric kiln fires in oxidation; a fuel kiln with adequate draft fires in oxidation; reduction requires deliberate restriction of air flow). 4. The damper controls the atmosphere (opening the damper increases draft and oxygen, creating oxidation; closing the damper restricts draft and creates reduction; the damper is the primary atmosphere control). 5. Body reduction happens at lower temperatures (reducing the atmosphere while the clay body is still porous allows carbon to penetrate the clay, creating the gray body characteristic of reduction-fired stoneware). 6. Glaze reduction happens at higher temperatures (reducing during the glaze melt allows carbon monoxide to interact with metal oxides in the liquid glaze, creating the distinctive colors of reduction firing). 7. Wood firing creates natural atmosphere variation (the cycle of stoking and burning creates alternating oxidation and reduction within the kiln; this natural variation produces the complex surfaces prized in wood-fired pottery). 8. Mastering atmosphere takes years of practice (reading the flame, adjusting the damper, timing the reduction; these skills develop through hundreds of firings and careful observation of results).