👉 In the context of chemistry, "celadon" refers to a type of ceramic material with a blue-green color. It was first discovered by the German chemist Karl Riedl in 1908 and is named after the town where it was found, Celadon, in Germany. The word "celadon" comes from the Greek words "kaleidoscope" (meaning "a large disc or plate") and "dalon" (meaning "blue"). It