Jun 13, 2019 · Ashes can be considered to be naturally occurring. Other sources of ash that can be used are reeds, grasses, straw, leaves, and so on. The high alkaline content, which acts as the flux in the glaze, is caustic, so some people wash the ashes before use. Washed ash does not flux as well as unwashed ash, and will require more ash content in the glaze.
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