An hua

An hua is a term used in meaning ''secret'' or ''veiled'' decoration; the designs being visible through transmitted light, produced either by incising the design into the porcelain before glazing and firing or by painting in white slip on the porcelain body.

The technique was used in the Ming dynasty , and later, particularly during the reign of the Yongzheng emperor . Some An hua dishes were found inside a storage jar in the mid-15th Century ''Belankan'' shipwreck off the coast of Indonesia, found circa 1999.