Modification Date: 2015-10-30 18:58:31
Member of Group: ASR6
The same 80:20 Alberta Slip:Frit base recipe that works at cone 6 oxidation also works in reduction
|Alberta Slip Calcined||40.0|
GA6-A is Alberta Slip raw:calcine mix with 20% frit 3134.
Ravenscrag Slip GR6-A (20% frit 3134) and Alberta Slip GA6-A (20% frit 3134) glazes on M340 at cone 5 reduction.
GA6A glaze fired at cone 5R on Plainsman M350 and M340.
GA6A glaze (Alberta Slip 80%, Frit 3134 20%) at cone 5R (left) and pure Alberta Slip at cone 10R (right).
Calcined Alberta Slip (right) and raw powder (left). These are just 5 inch cast bowls, I fire them to cone 020 and hold it for 30 minutes. Why calcine? Because for glazes having 50% or more Alberta Slip, cracking on drying can occur, especially if it is applied thick (Alberta Slip is a clay, it shrinks). I mix 50:50 raw:calcine for use in recipes. However, Alberta Slip has an LOI of 9%, so I need to use 9% less of the calcine powder (just multiply the amount by 0.91). Suppose, I needed 1000 grams: I would use 500 raw and 500*.91=455.
By Tony Hansen+