 A titanium dioxide tan colorant which contains a small amount of iron. Used both for color and its tendency to provide various mottled textures.
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This is classified as a Dark Rutile. This is the same mineral as the ceramic grade rutile but this has not been calcined.
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Most often used as a specking agent in clays.
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Most often used as a specking agent in clays.
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Feldspathic silica sands which can be used in place of grog in clay bodies to add texture and strength.
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Feldspathic silica sands which can be used in place of grog in clay bodies to add texture and strength.
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A high purity silica sand from Illinois.
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AKA Flint. The most common source of silica in clay bodies and glazes. Increases the thermal expansion in clays and decreases thermal expansion in glazes. Also used to raise the melting point in glaze. 200 mesh is often used in clay.
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325 mesh silica is typically used in glazes.
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A microcrystalline silica. A very finely divided or “micro” form of quartz physically bound together as loose agglomerates.
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Silicon carbide 60 grit.
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Sodium Carbonate. Dense. This is an active flux which serves an important function as a deflocculant in preparing liquid slip. It increases strength and workability and reduces shrinkage.
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Often used in Egyptian paste clays. (Baking soda)
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Sodium sulfate is added to glass formulas as a source of sodium and to prevent scumming. Sodium sulfate glasses are harder, stronger and have a higher softening point than soda-lime glasses without the sulfate addition.
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Spodumene. A source of lithia, which is a flux, that helps to develop copper blue tone glazes. Can replace feldspar and also reduces the vitrification temperature and shrinkage rate in glazes.
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Spodumene. A source of lithia, which is a flux, that helps to develop copper blue tone glazes. Can replace feldspar and also reduces the vitrification temperature and shrinkage rate in glazes.
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Similar to calcium. Also used as barium carbonate substitute.
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An economical, high purity, off-white talc. A major component in low fire, Cone 06-Cone 2 lighter colored clay bodies.
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The most effective opacifier to produce even, opaque, glossy glazes. The normal use of Tin Oxide in a glaze is between 5% and 10%. A dull matt glaze can result when used in excess.
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The most effective opacifier to produce even, opaque, glossy glazes. The normal use of Tin Oxide in a glaze is between 5% and 10%. A dull matt glaze can result when used in excess.
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Important opacifier. Often used in glaze to affect acid resistance, color and texture.
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Added to glaze to produce a matte and foamy surface.
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A very effective zirconium glaze opacifier. Ultrox opacifiers claim uniformity of glaze opacity, texture and color over a wide range of temperatures and compositions.
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A hydrated ferric oxide with manganese dioxide. It is used for brush decoration to produce a reddish-brown. Also can be added to clay bodies to achieve a darker color.
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Calcined. A useful, high temperature flux. It increases the maturing range of glazes and produces bright, glossy colors. Also may be used to give opacity to glazes.
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Balanced zircon, opacified frit for Cone 06 to Cone 1. A white frit for white, opaque glazes. Melting Range 1650°.
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Sold by the pound. A high calcium/sodium, low alumina frit for Cone 06. Often used in crystal glazes. High expansion. Melting Range 1600°.
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Used with other frits and raw materials at Cone 06 to Cone 01. Melting Range 1600°.
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Calcium Borate source used with other frits for low cost pottery glazes from Cone 06 to Cone 01. Melting Range 1450°.
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Very fluid, clear Cone 06 frit. Melting Range 1500°.
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