Hierarchy classification:

1. top of the aat hierarchies
2. Activities Facet
3. Processes and Techniques (hierarchy name)
4. [processes and techniques by specific type]
5. condition changing (processes)
6. surface or structural changes

Anotations

Scope note:

The swelling of clay objects during firing as gases are released in the vitrification process; sometimes caused by overfiring and occurs either generally or in small areas; generally considered a defect in pottery but sometimes desirable in nonbearing bricks for construction.