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Painted, incised and glazed earthenware. Dated 10th century, "Iran
. New York Metropolitan Museum of Art
Top section of a water jug or habb
. Earthenware. Late 12th-early 13th century Iraq or Syria. "Brooklyn Museum
Earthenware is glazed or unglazed "nonvitreous "pottery that has normally been fired below 1200°C. "Porcelain, "bone china and "stoneware, all fired at high enough temperatures to vitrify, are the main other important types of pottery.
all primitive pottery whatever the color, all terra-cottas, most building bricks, nearly all European pottery up to the seventeenth century, most of the wares of Egypt, Persia and the near East; Greek, Roman and Mediterranean, and some of the Chinese; and the fine earthenware which forms the greater part of our tableware today.
"Pit fired earthenware dates back to as early as 29,000–25,000 "BC. Outside "East Asia, porcelain was manufactured only from the 18th century, and then initially as an expensive luxury.
Earthenware, when fired, is opaque and non-vitreous, soft and capable of being scratched with a knife. The "Combined Nomenclature of the European Communities describes it as being made of selected "clays sometimes mixed with "feldspars and varying amounts of other minerals and white or light-colored (i.e., slightly greyish, cream or ivory).
Generally, earthenware bodies exhibit higher "plasticity than most whiteware bodies and hence are easier to shape by "RAM press, "roller-head or "potter's wheel than bone china or porcelain.
Due to its porosity, earthenware, with a water absorption of 5-8%, must be "glazed to be watertight. Earthenware has lower "mechanical strength than bone china, porcelain or stoneware, and consequently articles are commonly made in thicker cross-section, although they are still more easily chipped.
Darker-colored "terracotta earthenware, typically orange or red due to a comparatively high content of "iron oxide, are widely used for flower pots, tiles and some decorative and oven ware.
A general body formulation for contemporary earthenware is 25% "kaolin, 25% "ball clay, 35% "quartz and 15% "feldspar.
Terracotta flower pots with terracotta tiles in the background.
Modern earthenware may be "biscuit (or "bisque") fired to temperatures between 1,000 to 1,150 °C (1,830 to 2,100 °F) and "glost-fired (or "glaze-fired") to between 950 to 1,050 °C (1,740 to 1,920 °F), the usual practice in factories and some studio potteries. Some studio potters follow the reverse practice, with a low-temperature bisque firing and a high-temperature glost firing. The firing schedule will be determined by the raw materials used and the desired characteristics of the finished ware.
Historically, such high temperatures were unattainable in most cultures and periods until modern times, though "Chinese ceramics were far ahead of other cultures in this respect. Earthenware can be produced at firing temperatures as low as 600 °C (1,112 °F) and many clays will not fire successfully above about 1,000 °C (1,830 °F). Much historical pottery was fired somewhere around 800 °C (1,470 °F), giving a wide margin of error where there was no precise way of measuring temperature, and very variable conditions within the kiln.
After firing, most earthenware bodies will be colored white, buff or red. For red earthenware, the firing temperature affects the color of the clay body. Lower temperatures produce a typical red terracotta color; higher temperatures will make the clay brown or even black. Higher firing temperatures may cause earthenware to "bloat.
Types of earthenware
Chinese earthenware tomb sculpture.
The Walters Art Museum.
There are several types of earthenware, including:
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