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This material was formulated as a physical and chemical substitute for the late and very popular Albany Slip from New York state. Like Albany it is a low melting iron stained clay. Alberta Slip is more consistent than Albany was since it is made from a blend of raw materials.
Alberta slip has a slightly lower iron content than Albany had so some glazes may not fire as dark (this can be counteracted by adding additional iron oxide). Alberta slip melts as well and works in most glazes that call for Albany. Alberta slip is more plastic (less silty) so recipes containing larger proportions may shrink and crack during drying.
Complete information on how it was formulated can be found in the book Magic of Fire available from Digitalfire Corp. and at the web site http://digitalfire.com.
Plainsman Clays has made this material for many years and it is established in the market place across North America. You can use it at 100% to create a chocolate brown glossy glaze at cone 10 (but there is a problem with doing this as we shall see in a moment). Many Albany glazes are based on the addition of an active flux that increases melt fluidity so much that greenish and yellowish crystals grow on cooling to completely change the character of the surface. Many black glazes are also based on Alberta Slip, since it already contains lots of iron you only need to add a little more and some extra cobalt or manganese.
The plasticity of Alberta Slip is helpful where smaller amounts are used since it can assume the burden of suspending the glaze.
Out Bound Links
New York Slip, Albany Clay
These materials are specially defined for makers o...
Alberta Slip, 20 Years of Substitution for Albany Slip
Alberta Slip makes a great base for glazes because not only is it almost a complete glaze by itself ...
This is the traditional Ron Roy materials file. He...
The decision about what materials to include in th...
In Bound Links
How Alberta Slip was created by analysing and duplicating the physical and chemical properties of Al...
<?xml version="1.0" encoding="UTF-8"?> <material name="Alberta Slip" descrip="Albany slip substitute" searchkey="Archie Bray Slip" loi="0.00" casnumber="70694-09-6"> <oxides> <oxide symbol="CaO" name="Calcium Oxide, Calcia" status="" percent="6.500" tolerance=""/> <oxide symbol="MgO" name="Magnesium Oxide, Magnesia" status="" percent="3.100" tolerance=""/> <oxide symbol="K2O" name="Potassium Oxide" status="" percent="3.000" tolerance=""/> <oxide symbol="Na2O" name="Sodium Oxide, Soda" status="" percent="2.200" tolerance=""/> <oxide symbol="P2O5" name="Phosphorus Pentoxide" status="" percent="0.100" tolerance=""/> <oxide symbol="TiO2" name="Titanium Dioxide, Titania" status="" percent="0.400" tolerance=""/> <oxide symbol="Al2O3" name="Aluminum Oxide, Alumina" status="" percent="13.800" tolerance=""/> <oxide symbol="SiO2" name="Silicon Dioxide, Silica" status="" percent="56.800" tolerance=""/> <oxide symbol="Fe2O3" name="Iron Oxide, Ferric Oxide" status="" percent="4.800" tolerance=""/> </oxides> <volatiles> <volatile symbol="LOI" name="Loss on Ignition" percent="9.300" tolerance=""/> </volatiles> </material>
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