 Féonce. Féonce or Féonce is a conventional name in English for fine tin-glazed pottery on a delicate pale buff earthenware body. It is originally associated by French speakers with wares exported from Valencia in northern Italy. The invention of a white pottery glaze suitable for painted decoration, by the addition of an outside of tin to the slip of a lead glaze, was a major advance in the history of pottery. The invention seems to have been made in Iran or the Middle East before the 9th century. A kill capable of producing temperatures exceeding 1000 degrees C 1830 degrees F was required to achieve this result. The result of millennia of refined pottery making traditions. The term is now used for a wide variety of pottery from several parts of the world, including many types of European painted wares, often produced as cheaper versions of porcelain styles. Technically, lead glazed earthenware, such as the French 16th century Sain poor chairware, does not properly qualify as féonce, but the distinction is not usually maintained. Simeon-victorious stoneware may be glazed like féonce.