Augustus Wollaston Franks,
Archaeological Journal
(1851)
“ In the thirteenth century appear plates of metal, generally silver or gold, covered with a delicate chiselling in bas-relief, and clothed with colour by means of a coating of various transparent enamels through which the pattern is seen. And, lastly, in the fifteenth century, we find plates of metal, gold or copper, coated with a thick covering of enamel, on which the design is painted, [1] In these successive processes, we perceive a tendency to the concealment and subordination of the metal that forms the groundwork of the enamel. ”
