Methods of dating ancient pottery
Each of these different clays are composed of different types and amounts of minerals that determine the characteristics of resulting pottery.
There can be regional variations in the properties of raw materials used for the production of pottery, and this can lead to wares that are unique in character to a locality.
In all cases, the object of firing is to permanently harden the wares and the firing regime must be appropriate to the materials used to make them.
As a rough guide, modern earthenwares are normally fired at temperatures in the range of about 1,000°C (1,830 °F) to 1,200 °C (2,190 °F); stonewares at between about 1,100 °C (2,010 °F) to 1,300 °C (2,370 °F); and porcelains at between about 1,200 °C (2,190 °F) to 1,400 °C (2,550 °F).
Recently obtained radiocarbon accelerator mass spectrometry dates from the Gasya and Khummi sites (lower Amur River basin, the Russian Far East), on charcoal associated with pottery, fall within the interval 10345 ± 110 to 13260 ± 100 radiocarbon yr BP.
Now both Russian Far East and southern Japanese Islands present evidence of the earliest pottery-making technology in the world starting about 13 000 BP.
Kneading helps to ensure an even moisture content throughout the body.Glaze may be applied by dusting the unfired composition over the ware or by spraying, dipping, trailing or brushing on a thin slurry composed of the unfired glaze and water.The colour of a glaze after it has been fired may be significantly different from before firing.Glaze is a glassy coating on pottery, the primary purposes of which are decoration and protection.One important use of glaze is to render porous pottery vessels impermeable to water and other liquids.