Craft · 6 pages · 12 min

Why bisque and glaze are two firings

The first firing makes porous ceramic the glaze can soak into, and the second melts the glaze.

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From the opening

Bisque and glaze are two firings because the first turns fragile greenware into a porous ceramic you can handle, and the second melts the glaze onto that ceramic. The pot is hardened before it is coated, so the glaze meets a stable, thirsty surface. The opening covers bisque hardens fragile greenware, open pores take up the glaze, and the second fire melts the coat.

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Inside

Bisque hardens fragile greenware
Open pores take up the glaze
The second fire melts the coat
Once-firing skips the bisque
Where the idea stops applying
A distinction worth keeping

Sources

Bisque firing before glazing
Glaze firing of ceramic ware

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Why bisque and glaze are two firings

From the opening

Inside

Sources

Also on the desk