Note 5 — INTRODUCTION

The pi sê, or "secret colour," is used as a general term for glazes of the celadon type, among which the writer in question includes all the celebrated wares of antiquity from the T´ang "green (ts´ui) of a thousand hills," the Yüeh ware, the Ch´ai "blue (ch´ing) of the sky after rain," to the Sung Ju, Kuan, Ko, Tung–ch´ing, and Lung–ch´üan wares.