Pottery dating mark
Once a clay body has been kneaded and de-aired or wedged, it is shaped by a variety of techniques. There are several materials that are referred to as clay.The properties which make them different include: Plasticity, the malleability of the body; the extent to which they will absorb water after firing; and shrinkage, the extent of reduction in size of a body as water is removed.
Wedging can also help produce an even moisture content.Odai Yamamoto I site in Aomori Prefecture currently has the oldest pottery in Japan.Excavations in 1998 uncovered forty-six earthenware fragments which have been dated as early as 14,500 BC (ca 16,500 BP); this places them among the earliest pottery currently known. Such a date puts the development of pottery before the warming at the end of the Pleistocene.Thrown pieces can be further modified by the attachment of handles, lids, feet and spouts.Glaze is a glassy coating on pottery, the primary purposes of which are decoration and protection.