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The danger of mechanical cleaning is the potential for the surface to break or become scratched with a tool. Dusting is used when dirt is not strongly adhered to the surface of the ceramic and is carried out by either a brush or a soft cloth. Large ceramic vessels are cleaned with a delicate vacuum cleaner with a soft, muslin-covered head ...
Decorating ceramic pieces doesn’t have to be limited to glazes and slips. You can also draw on your in-progress pieces using brush-less implements such as underglaze pens, chalks, pencils, and more.
The vibrancy that only underglaze was able to supply is now achievable with a variety of over-glazes therefore discounting the advantage that underglaze commercial production had. A well-known New York underglaze tile and pottery decorator of the 1940s, Carol Janeway (1913-1989), was diagnosed with lead poisoning after eight years of using a ...
A raw material in various ceramic bodies, used as a filler to attenuate drying shrinkage but it also modifies the fired thermal expansion. Traditionally used in the UK, but has largely been replaced by quartz. Flocculate The opposite of deflocculate. Calcium chloride is a common flocculant used for glazes. Fluidity
Most pieces use only one of underglaze or overglaze painting. [15] Underglaze painting requires considerably more skill than overglaze, since defects in the painting will often become visible only after the firing. [14] During firing even refractory paints change color in the great heat. A light violet may turn into a dark blue, and a pale pink ...
The paper is either floated off by soaking the piece in water, or left to burn off during the firing. This can be done over or under the ceramic glaze, but the underglaze ("underprinting") method gives much more durable decoration. The ceramic is then glazed (if this had not been done already) and fired in a kiln to fix the pattern. With ...
Glazes need to include a ceramic flux which functions by promoting partial liquefaction in the clay bodies and the other glaze materials. Fluxes lower the high melting point of the glass forms silica, and sometimes boron trioxide. Raw materials for ceramic glazes generally include silica, which will be the main glass former.
Ceramic shell casting techniques using silica, zirconia and other refractory materials are currently used by the metal parts industry for 'net casting', forming precision shell moulds for molten metal casting. The technique involves a successive wet dipping and dry powder coating or stucco to build up the mould shell layer.
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