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In combination with chromium compounds addition of 0.5 - 1.5% tin oxide to a glaze result in a pink colour, with such glazes being known as Chrome-tin pinks. [ 43 ] [ 44 ] In conjunction with small additions of zinc oxide and titanium oxide, additions of tin oxide up to 18% to lead glazes can produce a satin or vellum surface finish. [ 31 ]
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.
Blue Mountain Pottery were known for their combinations of glazes that gave each item a unique finish. The initial glaze used was a deep blue-green, combined with a darker glaze. This combination of glazes, called a "flow glaze" or a "drip glaze" process, meant that during the firing process, each piece obtained a unique appearance. [1] [3]
Engobe or Slip Glaze - A combination of slip (liquid clay) and glaze. - Used to decorate or add texture before applying a final glaze layer. Conclusion Glazes are a vital part of pottery, offering endless possibilities for functional and artistic expression.
Ash glaze was the first glaze used in East Asia, and contained only ash, clay, and water. [2] [3] One of the ceramic fluxes in ash glazes is calcium oxide (CaO), commonly known as quicklime, and most ash glazes are part of the lime glaze family, not all of which use ash.
At the same time in China, green-glazed pottery dating back to the Han period (25–220 AD) gave rise eventually to the sancai ('three-color') Tang dynasty ceramics, where the white clay body was coated with coloured glazes and fired at a temperature of 800 degrees C. Lead oxide was the principal flux in the glaze.
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