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It is a low melting iron stained clay.
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 (requiring the use of a calcine:raw mix).
The plasticity of Alberta Slip is very helpful in suspending glaze slurries.