He points to glazes as an illustration of his point. There once was a time when each potter had to study and experiment endlessly to get just the right color. Today, by contrast, glazes can be bought in many different ready-mixed colors.
他舉釉藥為例，釉藥是一種化學物質，以前得靠不斷研究、實驗，才能調配出自己想要的顏色，不像現在有現成配好的釉藥。