Analysis of information sources in references of the Wikipedia article "Cloisonné" in English language version.
This was improved further in the second of the 17th Century when copper--a more pliable metal--replaced bronze as the metal for both bases and cloisons.
We doubt if any form of the enameller's art can equal the work executed in Japan, which is distinguished by great freedom of design, and the most exquisite gradations of color.