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. glass (material)
8. [glass by technique]

Anotations

Scope note:

Refers to a type of glass that was invented during the Gothic Revival in the 19th century and is characterized by an uneven thickness that is thicker in the center, and thinner on the edges. It is made by blowing the molten mixture into a rectangular mold, or by blowing and molding a bubble of glass into a box shape, then cutting the sides of the box to form rectangles of glass. The glass may be clear or colored.