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Colorants & Opacifiers

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sku: RMCUOXBLK

Black Copper Oxide (Cupric Oxide)

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Now: $20.00

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Clay & Minerals
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sku: RMIRONBLK

Black Iron Oxide

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Now: $2.50

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Clay & Minerals
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sku: RMUMBER

Burnt Umber

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Now: $5.00

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Clay & Minerals
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sku: RMCHROME

Chromium Oxide Green

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Now: $14.00

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Clay & Minerals
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sku: RMCOCARB

Cobalt Carbonate

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Now: $45.00

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Clay & Minerals
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sku: RMCOOX

Cobalt Oxide

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Now: $60.00

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Clay & Minerals
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sku: RMCUCARB

Copper Carbonate

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Now: $14.00

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Clay & Minerals
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sku: RMSILFFF

FFF Silicon Carbide

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Now: $9.00

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Clay & Minerals
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sku: RMILGR

Granular Ilmenite

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Now: $2.50

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Clay & Minerals
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sku: MANGGR

Granular Manganese (60-80 mesh)

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Now: $3.50

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Clay & Minerals
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sku: RMSILGR

Granular Silicon Carbide (60-80 mesh)

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Now: $7.50

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Clay & Minerals
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sku: RMIRONCHR

Iron Chromite

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Now: $1.75

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Clay & Minerals
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sku: RMCUOXBLK

Black Copper Oxide (Cupric Oxide)

One of the oldest colorants used by potters. It is a popular source of copper in glazes and glass. It is a very strong flux, in a mix of 50% Ferro borax frit 3134 it will dissolve a firebrick crucible at cone 6! It is the most stable form of oxidized...

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Now: $20.00
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Clay & Minerals
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sku: RMIRONBLK

Black Iron Oxide

Ceramics Monthly Technofile article from March 2011 "All about iron" by John Britt Iron—The fourth most common element in the earth’s crust and the most common element (in terms of mass) on the planet, comprising 35% of the...

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Now: $2.50
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Clay & Minerals
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sku: RMUMBER

Burnt Umber

Umber is a hydrated iron oxide that also contains significant manganese, calcia, alumina and silica. When umber is calcined (referred to as "burnt" because it is done to lower temperatures), the color intensifies. The material is used to color many...

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Now: $5.00
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Clay & Minerals
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sku: RMCHROME

Chromium Oxide Green

Chrome oxide is a very refractory ceramic colorant (even a 50% mix with a high borax frit will not even begin to melt it in a crucible). Chrome oxide is the only stable oxide of the metal chromium. It is a bright to...

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Now: $14.00
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Clay & Minerals
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sku: RMCOCARB

Cobalt Carbonate

A pinkish tan to purple-ish powder. It is a strong colorant and almost always produces blue in glazes (unless in very high percentages where it is black). Cobalt carbonate is an extremely active melter (even more than cobalt oxide), in a mix of 50% Ferro...

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Now: $45.00
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Clay & Minerals
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sku: RMCOOX

Cobalt Oxide

CoO is a metallic coloring oxide that produces blue in glazes at all temperatures (unless in very high percentages where it will be black). Black Cobalt Oxide is a key source of CoO used in glazes, glass, and enamels. Cobalt is the most...

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Now: $60.00
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Clay & Minerals
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sku: RMCUCARB

Copper Carbonate

Conceptually, copper carbonate is CuCO3, however this form is not normally available in the market (copper carbonate basic is the article of commerce) so the powder should be viewed as a family of compounds. This material is considered volatile during...

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Now: $14.00
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Clay & Minerals
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sku: RMSILFFF

FFF Silicon Carbide

SiC powder has some curious uses in ceramic glazes. It is employed to make crater and foam glazes. The silicon takes up available oxygen to make SiO2 and the carbon combines with oxygen to make the CO2 that creates...

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Now: $9.00
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Clay & Minerals
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sku: RMILGR

Granular Ilmenite

Ilmenite can be used in small amounts (-1%) to produce dark brown specks in bodies and specialized glazes. It also is used in combination with rutile to develop characteristic rutile break glazes; it seeds crystals in titania glazes.

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Now: $2.50
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Clay & Minerals
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sku: MANGGR

Granular Manganese (60-80 mesh)

In ceramics, it is used primarily in clay and glaze to achieve dark brown or black fired speckle. This is the same material as manganese dioxide powder, it is simply not ground to a fine powder. Typically a 60-80 mesh material is used in...

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Now: $3.50
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Clay & Minerals
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sku: RMSILGR

Granular Silicon Carbide (60-80 mesh)

Sometimes used to make speckles in glazes or clay bodies.

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Now: $7.50
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Clay & Minerals
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sku: RMIRONCHR

Iron Chromite

Also referred to as Iron Chromate A dense compound of iron and chromium. It is very refractory in oxidation, even with 50% borax and zero-alumina Ferro frit 3134 it does not melt. It is used in glazes to produce gray (with...

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Now: $1.75
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