CHAPTER III.

COMPOSITION OF WARES AND GLAZES.

Hard and Soft Pottery and Porcelain.--COMPOSITION OF PORCELAIN: Kaolin--Its Derivation and Ingredients--Petuntse--How prepared in China.--The European Process.--Differences between Chinese and European Porcelains.--Chemical Analysis.--English Porcelain and its Peculiarities: Its Average Composition.--How English Clay is prepared.--French Artificial Porcelain.--Parian.--COMMON EARTHEN-WARE: Table of Ingredients of different kinds.--General Table.--GLAZES: Classes.--Brongniart’s Classification.--Difference between Enamel and Glaze.--Silicious Glaze.--History.--Use of Oxides.--Egyptian Processes.--Metallic Lustre.--Stanniferous Enamel: Its History.....59