|Monthly Tech-Tip |
This was found clay was extracted about 4 feet below ground level in central Alberta, Canada. I got about 10 lbs to evaluate. About 1/3 of it has been spread out to dry on a plastic-covered board (it is fairly damp and it needs to be completely dry in order to slake at the next step). The greenish color suggests that we have a terra cotta. It is worth noting that when sampling clays take a cross-section, either up and down through the depth of the layer. Confine the sample to material that has the same appearance and texture, in doing so note the extent of the deposit to which you can get access. If possible dig multiple sample holes to see if the layer is level and of consistent thickness. Be careful to work on a representative sample.
Evaluating a clay's suitability for use in pottery
Would you like to be able to use your own found-clays in your production? Follow me as we evaluate a mystery clay sample provided by a potter who wants to do this.