Defect · Glaze firing
Glaze crawling from underfired bisque
Also called: dust crawl
Glaze beads up or pulls away from surfaces that were not fully cleaned of bisque dust.
- Appears at
- Glaze firing
- Severity
- Cosmetic
- How common
- Common
Causes
Most likely
- ·Bisque surface was dusty, greasy, or had fingerprints when glazed
Prevention
- ·Wipe bisqueware with a damp sponge before glazing
- ·Handle bisqueware with clean hands or gloves once cleaned
Can it be fixed?
- ·Refill affected areas with glaze and refire
Materials involved
Glaze materials whose chemistry sits behind this defect — each links to its reference page.
Related defects
Questions
- Why does glaze crawling from underfired bisque happen?
- Most often: Bisque surface was dusty, greasy, or had fingerprints when glazed. Other causes: none listed.
- Can glaze crawling from underfired bisque be fixed?
- Sometimes. Refill affected areas with glaze and refire.
- How do I prevent glaze crawling from underfired bisque?
- Wipe bisqueware with a damp sponge before glazing. Handle bisqueware with clean hands or gloves once cleaned.
Further reading. The industrial treatment of this defect in the Ceramicware Defects Handbook on Wikibooks (CC BY-SA 3.0).
Sources. Compiled from Claybench's defect reference — the descriptions, causes and remedies that appear consistently across standard ceramics references and studio practice; no single source. It is the same reference the photo diagnosis tool reasons over. Where the Wikibooks Ceramicware Defects Handbook covers a defect it is linked above.
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