These two close-ups of a fired cone 6 porcelain showing a big difference in surface smoothness. The deaired material on the right has a much smoother fired surface even though the non-deaired material on the left has been wedged much more. The transparent glaze does not hide the roughness.
The practice of removing air from clay as it is pugged. Deaired clay has better forming properties and produces a smoother fired surface.
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