There are a number of slips and earthenware clays that are available in dry form to be used in the formulation of a potter's own particular clay body recipe. To learn more about how to read a clay body recipe, click here
Albany slip is no longer available, but is often referred to in older clay body recipes. It produced a satin-gloss brown glaze at cone 10. A small amount of Albany slip could also be mixed with a small amount of flux to give similar results at lower temperatures.
Alberta SlipAlso know as Alberta clay, this fine-grained, dark slip clay can be used on a one-to-one ratio as a substitute for Albany slip. Its working properties are a very close match.
Blackbird SlipAlso known as Barnard slip, this is an iron-saturated slip that vitrifies between cone 4 and cone 10. It fires to a brown or black, depending on the kiln's atmosphere and temperature. It is sometimes used as a colorant, especially in clay bodies.
Lizella ClayThis is an earthenware clay with a fairly high iron content. It is similar to RedArt (see below), but fires to a light red.
Ravenscrag SlipThis is also known as Alberta Slip II, but do not be confused. Unlike Alberta slip, this is a light-colored slip clay that produces a light, silky-matte surface at cone 10. Fluxes can be added to the slip clay for a smoother surface, and coloring oxides work well with it to produce various colored slips.
RedArt ClayProduced by Cedar Heights, this is perhaps the best known commercially available dry earthenware clay used by studio potters in the United States. It has a high iron content and fires red to brown, depending on the kiln's atmosphere.