Soda firing is a ceramic technique where sodium carbonate (soda ash) is introduced into a hot kiln, creating distinctive and unpredictable glazes. The process starts with loading pottery into the kiln and heating it to high temperatures, typically around cone 10 (2350°F or 1287°C). Soda ash is then introduced, either by spraying a soda solution into the kiln or by placing soda-soaked materials inside. The soda vaporizes and interacts with the clay and glazes, forming a unique sodium-silicate glaze. This results in a variety of surface textures and colors, from glossy to matte, often with tactile qualities. Soda-fired pottery is characterized by its variation and uniqueness, with each piece displaying different markings and colors. This technique has historical roots in the 15th-century European salt firing but gained popularity in the 20th-century United States. Modern ceramic artists appreciate soda firing for its spontaneity and the unique outcomes it produces. The benefits of soda f...
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