Soda firing is a type of stoneware firing wherein soda ash and baking soda are introduced to the flame when the kiln is nearly at its hottest. The heat of the firing splits the sodium carbonate and sodium bicarbonate (soda ash and baking soda, respectively) into their component elements, sodium and carbon. The flame carries this vapor into the firing chamber and onto the pots. The sodium interacts with the silica and calcium carbonate in the ware (as well any slips or glazes that have been applied to the ware) to form a layer of glass. It’s fired to a very high temperature – between 2200 and 2400 degrees fahrenheit – so it’s very durable.
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