Craft · 6 pages · 12 min
Why crazing is a crack in the glaze not the pot
The glaze cracks when it shrinks more than the clay, leaving the body underneath intact.
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From the opening
Crazing is a network of fine cracks in the glaze, caused when the cooling glaze contracts more than the clay body and is pulled into tension until the glass breaks. The pot underneath can be whole, and the crack is in the glassy coat, not a break through the wall. The opening covers the glaze shrinks more than the clay, glass fails in tension, and the body underneath can stay whole.
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Inside
- The glaze shrinks more than the clay
- Glass fails in tension
- The body underneath can stay whole
- Shivering is the opposite mismatch
- Where the idea stops applying
- A distinction worth keeping
Sources
- Glaze fit and thermal expansion
- Crazing as cracks in the glaze