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The pigment fuses with the glaze, and appears to be underneath a layer of clear glaze; generally the body material used fires to a whitish colour. The best known type of underglaze decoration is the blue and white porcelain first produced in China, and then copied in other countries.
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.
A ceramic flux functions by promoting partial or complete liquefaction. [1] [2] The most commonly used fluxing oxides in a ceramic glaze contain lead, sodium, potassium, lithium, calcium, magnesium, barium, zinc, strontium, and manganese. These are introduced to the raw glaze as compounds, for example lead as lead oxide.
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 underglazes I use work best when applied to a white base. The crank clay is my absolute favourite. It has a sand-like texture and when fired it comes out looking and feeling like well done toast.
This combined underglaze blue outlines with overglaze enamels in further colours. [68] The wucai technique was a similar combination, with underglaze blue used more widely for highlights. [69] Two-colour wares, using underglaze blue and an overglaze colour, usually red, also produced very fine results.
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