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he also had to know when to quench the kiln with water so as to produce the surface glaze.
enciklopedično besedilo iz 17. stoletja "tiangong kaiwu", je uporabil zgodovinar timothy brook, da je orisal proizvodnjo opeke kitajske dinastije ming::"...pečar je moral zagotoviti, da je temperatura v peči ostala na ravni, ki je povzročila na glini lesk barve staljenega zlata ali srebra.