Hierarchy classification:

1. top of the aat hierarchies
2. Materials Facet
3. Materials (hierarchy name)
4. materials (substances)
5. [materials by composition]
6. inorganic material
7. clay
8. [clay by product]
9. [ceramic and ceramic by product]
10. ceramic (material)
11. porcelain (material)

Anotations

Scope note:

Material comprising hard paste porcelain modified by the addition of bone ash to the usual clay and feldspathic rock. It is characterized by being bright white in color. A patent was first taken out in the 1740s by Thomas Fry at Bow for the use of bone ash in china ware, but bone china in its present form was first introduced by Spode in 1796. Softer than hard-paste porcelain, more durable and economical than soft-paste, it became the standard English porcelain body in the 19th century and is still used today.