Oxides & Opacifiers

Versatile pigment producing red, khaki or yellow in the presence of zinc. Incorporation with tin produces pink (chrome tin pink).Normally additions of 1-3% is used. A 1% addition to low firing leaded glazes with a soda content gives a brilliant yellow.

1 - 3% to obtain a blue glaze. Ethical Statement: We only use suppliers when we are satisfied that our ethical values have been met. Please see attached information from our supplier relating to their ethical practices in the DRC.

Weaker than copper oxide, but gives an evenly textured glaze less prone to speckling. 3 - 7 % addition.

To use as a Glaze thickner or binder add between and 0.25- 1% It may also be used as a plasticiser. 2.5 % of the dry weight of the clay) for increasing the dry strength of bodies. Gum arabicis used as an additive to glazes or underglazes to give a harder surface when dry. This avoids rubbing and smudging before firing. Mix with hot water. Gum arabic is used as an additive to glazes or underglazes...

Produces black in combination with cobalt.

2 - 10% produces colours from honey to dark brown.

1 - 5% a coarse grade gives crystalline black specks.

A good alkaline flux used as a substitute for soda and potash when a good craze resistance is required. Provides typical alkaline colour response. Analysis Li2CO3

Generally produces colours obtained from manganese dioxide but is weaker and more finely divided.

When applied for full coverage, Cobalt Wash fires to a rich cobalt blue with a glossy finish. It can be used for stenciling, stamping, and silkscreening if it is layered with a stable transparent glaze. Sometimes even if a glaze is stable, there can be some blurring of the lines when the glaze is applied thick and it is fired in a vertical orientation. When used in combination, Cobalt Wash will add...

Iron Wash fires to an opaque deep rust red with a smooth matte finish. It works great for stenciling, stamping and silkscreening as it is a very stable product. When using in combination, apply a transparent and stable glaze such as a celadon or clear glaze to ensure stability in performance and maintaining details. Can be layered with other glazes to promote interactions and does not add much movement...

Rutile Wash fires to an opaque pale burnt orange with a smooth matte finish. It works great for stenciling, stamping and silkscreening as it is a very stable product. When using in combination, apply a transparent and stable glaze such as a celadon or clear glaze to ensure stability in performance and maintaining details. Can be layered with other glazes to promote interactions and does not add much...

Rutile is used as an ore containing titanium and iron oxide. It gives a weak buff brown tint and is more commonly used to give dramatic texture to a glaze of broken or mottled colour, although it does not give this effect in lead glazes. Excellent for modifying other stains or oxides . Rutile is also widely used in crystalline glazes.

A 5% addition gives a localised reduction effect in an electric kiln. The effect requires a leadless Tin based glaze and aids colour development. Large quantities will cause severe blistering. Silicon Carbide powder has some curious uses in ceramic glazes and can be used to make crater and foam glazes.

The most reliable, oldest, and most widely used opacifier. Produces a softer white and less refractory (neutral) than zircon. 4 - 5% produces semi -opaque glazes 8 - 10% gives a fully opaque glaze.

Up to 10% addition gives a weak yellow as a stain. Can be used at a higher temperature than antimony oxide, gives an opaque yellow when used in combination with tin oxide.

An ultra fine form of Zircon used as an opacifier. Add 5 - 8% for semi opaque and 10 - 15% for fully opaque glazes.