Alberta Slip

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Quick Overview

A dark firing, high iron clay used for clay and glaze recipes.



Mined as a substitute for Albany Slip. Similar in color, firing temperature and application.

"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

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. 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."


Oxide Analysis Formula
CaO 6.50% 0.44
MgO 3.10% 0.30
K2O 3.00% 0.12
Na2O 2.20% 0.14
P2O5 0.10% 0.003
TiO2 0.40% 0.019
Al2O3 13.80% 0.52
SiO2 56.80% 3.62
Fe2O3 4.80% 0.12
LOI 9.30
Oxide Weight 347.74
Formula Weight 383.40

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