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Celadon /ˈsɛlədɒn/ is a pale greyish shade of green, or rather a range of such shades. Celadon originates as a term for a class of Chinese ceramics, copied by Korea and Japan. However, the name, which is European, may originate from the character Celadon in L'Astrée, a French pastoral novel of 1627, who wore a light green color.

Celadon glazes were very common, with the green color being reliably produced from about the 10th century onwards; this was appreciated in Asia for resembling jade, the most prestigious material of all. The glaze color comes from iron oxide's transformation from ferric to ferrous iron (Fe2O3 → FeO) during the firing process,[21] but is affected by a wide range of other factors and chemicals, making the precise color very difficult to control. As well as green, a wide range of browns, yellows, greys and sometimes blues all count as "celadon".