The second firing of pottery or ceramic ware after the glaze has been applied, which fuses the glaze to the clay body.
From Old English 'glæstian,' meaning to glaze. The term developed in pottery-making traditions, specifically referring to the heating process that transforms raw glazed clay into finished ceramic ware.
That smooth, shiny finish on your favorite mug exists because of the glost firing—heat transforms powdery glaze into a glass-like coating, which is why ancient potters were like early chemists experimenting with temperature and materials.
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