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Alberta Slip Base Cone 10R

Code: GA10-A
Modification Date: 2017-06-07 13:17:31
Member of Group: AS10

Alberta Slip at 60:40 calcine:raw makes a great tenmoku-like glaze at cone 10R


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 Tenmoku at cone 10R (a 1% iron addition is needed). Unlike many Tenmokus, it is not too fluid.

The color of this glaze varies considerably with thickness. Its thermal expansion is low enough that it does not easily craze on stonewares or porcelains.

Like Albany, Alberta Slip is a clay. It shrinks during drying, more than Albany did. Using pure Albany as a glaze required calcining part of the mix (to prevent cracking during drying). Alberta Slip is the same, however it requires a higher calcine-to-raw proportion. While calcining is an extra step, the capacity to change the calcine:raw proportion gives you control over the properties of the slurry. Ideally it needs to be plastic enough to suspend well and harden on the ware, but not so plastic that it shrinks too much during drying. For calcining instructions please visit

In our lab we can make 1 Canadian gallon using a mix of 2800 water and 3000 dry (1500 Alberta Slip, 1500 Calcined Alberta Slip). This produces a specific gravity of 1.43 at about the right viscosity for dipping. We add a 1-2 grams of Epsom Salts to this to gel the slurry a little for better application properties. A 1-2 second dip in 1850F bisque ware produces the right thickness.

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By Tony Hansen

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