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Antimony Oxide
Antimony Oxide
An oxide with various properties depending on its combination with other oxides .It is a semi metal ,having properties belonging to non-metal and metal oxides It is a glass former. It is also a modifier and opacifier. It modifies lead oxide to produce a yellow colour.
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Chromium OxideChromium Oxide
Chromium Oxide
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. Ref.CHRO
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CMC Finnfix (Organic Polymer)
CMC Finnfix (Organic Polymer)
Added to glazes for application by brushing, generally incorporate up to 5% of binder. Mix with a glaze stirrer attachment or hand blender untill glaze is smooth. Also useful in 0.5 - 2% addition to avoid colour transfer or for majolica painting. Carboxymethyl cellulose
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Cobalt Carbonate
Cobalt Carbonate
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.
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Cobalt OxideCobalt Oxide
Cobalt Oxide
The most powerful colouring oxide. This produces a deep blue or blue- black colour in lead and leadless glazes and a vivid blue in alkaline glazes. It gives good colour variations when used in combination with other oxides. 1 - 1.5% for a deep blue. Ethical Statement: We only use suppliers when we are satisfied that our ethical values have been met. Please see attached information from our supplier...
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Copper CarbonateCopper Carbonate
Copper Carbonate
Weaker but gives an evenly textured glaze less prone to speckling. 3 - 7 % addition.
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Copper OxideCopper Oxide
Copper Oxide
Copper Oxide

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Gum Arabic
Gum Arabic
Gum Arabic 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...
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Ilmenite
Ilmenite
Ilmenite is used to give a granular or spotty effect ,or else gives texture to a glaze. The ore contains titanium and iron oxide. Analysis FeO2 TiO2
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Iron ChromateIron Chromate
Iron Chromate
Produces black in combination with cobalt Ref.IROC
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Iron Oxide Black IROB
Iron Oxide Black IROB
Ferrous oxide.4 - 8 % gives darker shades than the red. Ref.IROB

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Iron Oxide Natural Red PC4510
Iron Oxide Natural Red PC4510
2 - 10% produces colours from honey to dark brown. Ref.PC4510
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Iron Oxide Red IROR
Iron Oxide Red IROR
Synthetic ferrous oxide. 2 - 10% produces even shades ranging from ambers to brown. Ref.IROR

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Iron Oxide Spangles IROS
Iron Oxide Spangles IROS
1 - 5% a coarse grade gives crystalline black specks. Ref.IROS
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Iron Oxide Yellow OchreIron Oxide Yellow Ochre
Iron Oxide Yellow Ochre
Ferric Oxide.3 - 8% produces browns and honey yellows in glazes depending on amount. Ref.IOYO
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Lithium Carbonate
Lithium Carbonate
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
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Magnesium Carbonate
Magnesium Carbonate
Magnesium Carbonate Used as a high temperature flux in stoneware glazes (up to 10%) producing a semi matt surface. Larger quantities give an opaque dry appearance BUT may cause crawling and pin holing- CAUTION
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Manganese Carbonate
Manganese Carbonate
Generally produces colours obtained from manganese dioxide but is weaker and more finely divided. Ref.MANC
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Manganese Dioxide
Manganese Dioxide
0.2 -5% gives pink to brown in lead and leadless glazes .Gives a rich blue plum in alkaline tin ones, it can also give a rich violet when combined with small amounts of cobalt.
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Nickel OxideNickel Oxide
Nickel Oxide
Will produce greens, brown and grey glazes. It works best in combination with other oxides to give a subtle grey hue to other colours, such as cobalt or iron oxide.
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Rutile
Rutile
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.
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Silicon Carbide Coarse 150's
Silicon Carbide Coarse 150's
Used for specking and reaction type glazes
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Silicon Carbide Fine 240'S
Silicon Carbide Fine 240'S
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.
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Sodium Hexa-Metaphosphate (Calgon)
Sodium Hexa-Metaphosphate (Calgon)
Sodium Hexa-Metaphosphate (Calgon) A significant use for sodium hexametaphosphate is as a deflocculant in the production of clay-based ceramic particles. It is also used as a dispersing agent to break down clay and other soil types for soil texture assessment.

Tin Oxide
Tin Oxide
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.

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Titanium Dioxide
Titanium Dioxide
Used as a glaze opacifier. Additions of up to 10% produce a creamy white glaze with a matt or semi matt surface. Slow cooling assists crystallization.
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Vanadium Pentoxide
Vanadium Pentoxide
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.
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Zinc Oxide
Zinc Oxide
The source of zinc, and in small amounts, is useful as a flux in middle and high temperature glazes imparting a wider firing range and good craze resistance . Above 10% tends to produce a frost-like matt surface with some opacity and can cause occasional pinholing . Also makes glazes susceptible to crawling - CAUTION
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Zirconium Silicate
Zirconium Silicate
An ultra fine form of Zircon used as an opacifier. Add 5 - 8% for semi opaque and 10 - 15% for fully opaque glazes.
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