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Underglaze is a method of decorating pottery in which painted decoration is applied to the surface before it is covered with a transparent ceramic glaze and fired in a kiln. Because the glaze subsequently covers it, such decoration is completely durable, and it also allows the production of pottery with a surface that has a uniform sheen.
As with nearly all Chinese blue and white porcelain, this was painted when leather-hard, and probably the spout and rings were added. In pottery, leather-hard is the condition of a clay or clay body when it has been partially dried to a consistency similar to leather of the same thickness as the clay. At this stage, the clay object has ...
African red slip ware: moulded Mithras slaying the bull, 400 ± 50 AD.. A slip is a clay slurry used to produce pottery and other ceramic wares. [1] Liquified clay, in which there is no fixed ratio of water and clay, is called slip or clay slurry which is used either for joining leather-hard (semi-hardened) clay body (pieces of pottery) together by slipcasting with mould, glazing or decorating ...
Slipware is pottery identified by its primary decorating process where slip is placed onto the leather-hard (semi-hardened) clay body surface before firing by dipping, painting or splashing. Slip is an aqueous suspension of a clay body, which is a mixture of clays and other minerals such as quartz, feldspar and mica.
Gregor is known for her abstracted human figure sculptures, featuring complex layers of underglaze and glaze and occasionally metallic lusters. Gregor builds her forms out of solid clay, then slices them open with a strong wire to enable hollowing as the clay enters its dryer 'leather hard' stage.
Crazing is a spider web pattern of cracks penetrating the glaze. It is caused by tensile stresses greater than the glaze is able to withstand. [1] [2] Common reasons for such stresses are: a mismatch between the thermal expansions of glaze and body; from moisture expansion of the body; and in the case of glazed tiles fixed to a wall, movement of the wall or of the bonding material used to fix ...
Ceramic glaze, or simply glaze, is a glassy coating on ceramics. It is used for decoration, to ensure the item is impermeable to liquids and to minimize the adherence of pollutants. It is used for decoration, to ensure the item is impermeable to liquids and to minimize the adherence of pollutants.
The process of burnishing pottery happens when the clay is in a “leather-hard” state. Leather-hard clay is partially dried clay that is in-between being malleable and being brittle. [2] It is important to wet the piece before burnishing because scratch marks will be present on the surface if the clay is too dry. [2]
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