|Monthly Tech-Tip |
During sample preparation, I set aside a piece to use for particle size distribution testing. I broke it up on the concrete floor using my "smoosher", a heavy iron pipe with an inch-thick iron plate welded on the bottom (it was evident during that process that the clay has excellent dry strength and hardness). I then weighed out 50 grams and put it into hot water for slaking (notable is the fact that rewetted clay slakes in minutes, more readily than the original raw material). Then I washed it through the finest of the sieves I am using, 100 mesh. In the next step I will wash the #100 oversize through #40, #60, #80 and #100 mesh (washing it through the #100 first works best, the lower screens often clog and blind if one tries to wash it through all of them at once).
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.