Ceramic ware must by definition undergo at least one firing, which converts the shaped ware irreversibly into a hard product, resistant to water and chemicals. Unglazed ware is fired only the once.
CITATION STYLE
Singer, F., & Singer, S. S. (1963). Firing and Kilns. In Industrial Ceramics (pp. 854–1061). Springer Netherlands. https://doi.org/10.1007/978-94-017-5257-2_11
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