Although glaze compositions vary regionally and chronologically, depending on the formation of the body and the glazing process employed, objects produced with different glazing techniques do not exhibit immediate diagnostic chemical variations in their compositions. The recognition of the various glazing techniques, through microscopic observations of the degree of sintering and the vitreous phase of quartz body, is also ambiguous. For instance, objects with applied glazes and those which may have been glazed by efflorescence have overlapping characteristic features. The following proposed criteria are subject to variation caused by increases in flux concentration, firing temperatures and time at peak temperatures.