Clay powder is mixed with water to turn it into workable clay. There are a couple of different methods to do this.
1) Some people mix by hand, adding a bit of water to the clay powder at a time and hand-kneading it like dough until it has the proper consistency.
2) Some people prefer to add the powder to water in a bucket, mixing it with a paddle attached to an electric drill (similar to mixing house paint). Do this until it has the consistency of heavy cream, then pour it into a plaster bat and let it stiffen to modeling consistency.
Whichever method you use, you then need to wedge the clay before using it.
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