Ye Chenxi's father Ye Xiaochun is a sixth generation inheritor of the Longquan celadon. If the glaze was too thick or too thin, or impurities from the air got in, they would all leave undesirable marks on the final products," Ye Chenxi says. "Kilning is the hardest work, but it is very good test for celadon makers," says Ye Xiaochun, …