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The information learned from vase paintings forms the foundation of modern knowledge of ancient Greek art and culture. Most ancient Greek pottery is terracotta, a type of earthenware ceramic, dating from the 11th century BCE through the 1st century CE. The objects are usually excavated from archaeological sites in broken pieces, or shards, and ...
Cracking may appear in greenware as well as each stage of the firing including bisqueware and glazed ware. [1] Fracture in greenware resulting in stresses during the making. To avoid cracks in greenware uniformity should be maintained in the thickness of the pot, the drying of the greenware, as well as consistency of the clay body itself.
A second typical defect is from poor design and construction. An example of this would be a ceramic piece with a handle too thin to support the weight of the cup. A third manufacturing defect is careless firing: a ceramic piece that has been fired too rapidly or allowed to dry unevenly will crack or break. [4]: p.20
Craquelure in the Mona Lisa, with a typical "Italian" pattern of small rectangular blocks Age craquelure in pottery. Craquelure (French: craquelure; Italian: crettatura) is a fine pattern of dense cracking formed on the surface of materials. It can be a result of drying, shock, aging, intentional patterning, or a combination of all four.
Terracotta flower pots with terracotta tiles in the background Due to its porosity, fired earthenware, with a water absorption of 5-8%, must be glazed to be watertight. [ 11 ] Earthenware has lower mechanical strength than bone china, porcelain or stoneware, and consequently articles are commonly made in thicker cross-section, although they are ...
Terracotta will also ring if lightly struck, as long as it is not cracked. [33] Painted (polychrome) terracotta is typically first covered with a thin coat of gesso, then painted. It is widely used, but only suitable for indoor positions and much less durable than fired colors in or under a ceramic glaze.