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GA6-G - Alberta Slip Lithium Brown Cone 6

Modified: 2024-08-11 02:42:45

Plainsman Cone 6 Alberta Slip based glaze.

Notes

One of the most popular Albany Slip glazes was 11% lithium, 4% tin oxide and 85% Albany Slip. This recipe reduces the lithium by more 50% eliminating the shivering problems that were common. This also employs a frit to help melt the glaze (in the absence of the 6% lithium carbonate). The added alumina darkens the color and slightly dulls the gloss (leave it out if you want).

Visually, this glaze works very well on porcelain showing variegated effects even on smooth surfaces, especially with variations in thickness. However, it may craze on porcelains, add more lithium to fix that.

Our G3933EF is similar, it employs 6% lithium carbonate.

Related Information

Roasting Alberta and Ravenscrag Slips at 1000F: Essential for good glazes

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Roasted Alberta Slip (right) and raw powder (left). These are thin-walled 5 inch cast bowls, each holds about 1 kg. I hold the kiln at 1000F for 30 minutes. Why do this? Because Alberta Slip is a clay, it shrinks on drying (if used raw the GA6-B and similar recipes will crack as they dry and then crawl during firing). Roasting eliminates that. Calcining to 1850F sinters some particles together (creating a gritty material) while roasting to 1000F produces a smooth, fluffy powder. Technically, Alberta Slip losses 3% of its weight on roasting so I should use 3% less than a recipe calls for. But I often just swap them gram-for-gram.

Alberta Slip used in the common lithium-tin cone 6 glaze

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This is 85% Alberta Slip, 11% lithium and 4% tin fired at cone 6 in oxidation. Like the original Albany version, it has a very low thermal expansion (because of the high lithium content) and likes to shiver on many clay bodies.

A variation of Albany lithium brown glaze

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Alberta Slip 75, lithium carbonate 10, tin oxide 4, nepheline syenite 11, calcined alumina 5.

A classic Albany glaze that often shivers

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These mugs have experienced very serious shivering. This is an Albany Slip glaze with 10% lithium carbonate, it is known to have a very low thermal expansion. This problem can be solved by reducing the amount of lithium or adding high-expansion sodium or potassium. However these fixes will likely affect the appearance.

Adding 6% lithium carbonate to an Alberta Slip glaze does this

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Left is G3933A, it is an 80:20 mix of our matte and glossy cone 6 base recipes (plus a mix of iron oxide, tin oxide and rutile). The body is Plainsman Coffee Clay. Because of repeated issues with crawling a project was started to create the same effect using Alberta Slip to supply as much of the chemistry as possible. Along that road, the opportunity arose to add lithium (to duplicate Amaco PC-32, a classic Albany/Lithium recipe). That is the glaze on the mug on the right, G3933G1, it has 6% lithium carbonate. Lithium is a super powerful melter, turning this into a very reactive glaze! To make a 500ml jar of brushing glaze, in 2023, required about $7 worth of lithium carbonate.

Links

XML to Paste Into Insight-live

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<recipe name="Alberta Slip Lithium Brown Cone 6" keywords="Plainsman Cone 6 Alberta Slip based glaze." id="35" date="2024-08-11" codenum="GA6-G" altcodenum="G2415E">
<recipelines>
<recipeline material="Alberta Slip" amount="40.000"/>
<recipeline material="Alberta Slip 1000F Roasted" amount="35.000"/>
<recipeline material="Ferro Frit 3195" amount="21.000"/>
<recipeline material="Lithium Carbonate" amount="5.000"/>
<recipeline material="Alumina Calcined" amount="5.000"/>
<recipeline material="Tin Oxide" amount="4.000" added="1"/>
<url url="https://digitalfire.com/recipe/35" descrip="https://digitalfire.com/recipe/35"/>
</recipelines>
<urls/>
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