celmassa
Celamassa is a term that appears to be a misspelling or a highly obscure variant of "celadon glaze". Celadon refers to a type of high-fired stoneware characterized by its distinctive pale green or grayish-green glaze. This glaze is achieved through the use of iron oxide as a colorant, fired under specific reducing conditions in a kiln.
The origins of celadon glaze can be traced back to China, with the earliest examples dating to
Celadon glazes were not exclusive to China. Similar techniques and aesthetics were developed in Korea, notably