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A pot-in-pot refrigerator, clay pot cooler [1] or zeer (Arabic: زير) is an evaporative cooling refrigeration device which does not use electricity. It uses a porous outer clay pot (lined with wet sand) containing an inner pot (which can be glazed to prevent penetration by the liquid) within which the food is placed. The evaporation of the ...
The method, a form of passive controlled-atmosphere storage, works by sealing fruit in the clay-rich mud, restricting flow of air, moisture and microbes, much as a plastic bag would. Discs are formed from two bowl-shaped pieces, which are sculpted from mud and straw, and baked in the sun before being filled with up to 1–2 kilograms (2.2–4.4 ...
There are also several traditional techniques of handbuilding, such as pinching, soft slab, hard slab, and coil construction. Other techniques involve threading animal or artificial wool fiber through paperclay slip, to build up layers of material. The result can be wrapped over forms or cut, dried and later joined with liquid and soft paperclay.
Hand-building: This is the earliest forming method. Wares can be constructed by hand from coils of clay, combining flat slabs of clay, or pinching solid balls of clay or some combination of these. Parts of hand-built vessels are often joined with the aid of slip. Some studio potters find hand-building more conducive for one-of-a-kind works of art.
They are made by the combination of two types of clay: the first is taken from the surface of the earth and the second after digging more than 10 feet deeper into the earth. Making a matka is a long process of at least 8 days. The clay is mixed with water, shaped, finished, polished, dried and fired in a kiln for 5 days.
Grog, temper for clay. Grog, also known as firesand and chamotte, is a raw material usually made from crushed and ground potsherds, reintroduced into crude clay to temper it before making ceramic ware. It has a high percentage of silica and alumina. It is normally available as a powder or chippings, and is an important ingredient in Coade stone.
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Ong (옹; 甕, 瓮) refers to a clay jar. [citation needed] Pottery has been used on the Korean peninsula since prehistoric times for food storage. In the Three Kingdoms period, images of large and small pottery appear on the murals of Anak Tomb No. 3 in Goguryeo, and in Baekje and Silla. Records indicate that they were used to store rice ...