Alternate Names: New York Slip, Albany Clay
|If this formula is not unified correctly please contact us.|
|GSPT - Frit Softening Point||1170C|
|SVWT - Sieve Analysis Wet||on 60 mesh: 0 on 120 mesh: 1.0% on 200 mesh: 5%|
Albany was a low plastic silty clay that was mined in Albany, New York for many decades. It melts to a glossy chocolate brown glaze at cone 8-10. It was a very popular glaze ingredient for dark colors and tenmoku and iron crystal effects. In the early 20th century it was used extensively on heavy utilitiarian stoneware across North America and even on electrical insulators. Glazes could be formulated very easily using this material as a starting point since it was already balanced and had good slurry properties. Potters especially adopted this material and it appears in thousands of recipes used across North America.
There are a number of substitutes for Albany and anyone with ceramic chemistry calculation software can easily speculate on a mix of materials that matches the chemistry on paper. However keep in mind that judging the similarity to Albany is a complex issue of mineralogy, physical properties and chemistry and it depends on the reliability of the information at hand on what Albany actually was.
A clay-rich earth, named for its mining location near Albany, New York, USA. Albany is a glacial clay, popular as a mid-fire hydrous alumino-silicate earth rich in alkalies and irons. Perhaps more popular as a slip for engobes or casting (owing to its relatively low-shrinkage character) than for wheel-throwing or hand-building, it is popularly added in small proportions to enhance most any glaze's or clay's viscosity. Similar products are mined around the world, and some claiming to be "substitutes" include the "Alberta" and "Jasper" slips.
Lithium, albany glaze at cone 5 using original albany slip
Albany Slip was a pure mined material, Alberta Slip is a recipe of mined materials and refined minerals designed to have the same chemistry, firing behavior and raw physical appearance.
This shows the soluble salts in the material and the characteristic cracking pattern of a low plasticity clay. Notice the edges have peeled badly during cutting, this is characteristic of very low plasticity.
These are three runs of Alberta Slip being compared with the original Albany Slip. These are ten-gram balls fired on porcelain tiles at cone 6. This test shows how the material flows, how much gases of decomposition it generates and how well it allows them to escape. As you can see, they are very similar in melting behavior.
Out Bound Links
Archie Bray Slip
In Bound Links
Blackbird Slip, Blackbird Clay, Barnard Clay
Alberta Slip creates a glossy transparent brown at cone 10 with the simple addition of 10% frit.
2011-08-02 - In oxidation, Alberta Slip creates a glaze that is more transparent and lighter in color. It also melts less than in cone 10R so a little flux is need...
Alberta Slip at 60:40 calcine:raw makes a great tenmoku-like glaze at cone 10R
2011-08-02 - Alberta Slip, like the original Albany Slip, melts to a beautiful glossy deep brown at cone 10R. Use as a pure glaze, it stops just short of being Ten...