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Minton majolica game pie dish, lead-glazed earthenware, c. 1875, an iconic example of High Victorian appetite for innovation with humour/whimsy, coloured lead glazes. Lead-glazed earthenware is one of the traditional types of earthenware with a ceramic glaze, which coats the ceramic bisque body and renders it impervious to liquids, as ...
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.
A high-lead glaze has a linear expansion coefficient of between 5 and 7×10 −6 /°C, compared to 9 to 10×10 −6 /°C for alkali glazes. Those of earthenware ceramics vary between 3 and 5×10 −6 /°C for non-calcareous bodies and 5 to 7×10 −6 /°C for calcareous clays, or those containing 15–25% CaO. [16] Therefore, the thermal ...
The hand-crimped all-butter crust features three layers: a cranberry compote, a spiced brown butter almond frangipane, and shingled heirloom apple slices that are brushed with an apricot glaze.
Ceramic industries are reluctant to use lead alternatives since leaded glazes provide products with a brilliant shine and smooth surface. The United States Environmental Protection Agency has experimented with a dual glaze, barium alternative to lead, but they were unsuccessful in achieving the same optical effect as leaded glazes.
Tin-glazing is the process of giving tin-glazed pottery items a ceramic glaze that is white, glossy and opaque, which is normally applied to red or buff earthenware. Tin-glaze is plain lead glaze with a small amount of tin oxide added. [1] The opacity and whiteness of tin glaze encourage its frequent decoration.
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