Step 3: Note floating organics, feel the consistency, take out any larger rocks

It was immediately evident that it was not suspending well, it settled to the bottom quickly and felt fairly sandy. This is not a good sign since it will make slurry processing difficult (because the settling material will immediately clog up the sieve). That being said, a small amount of added bentonite would help to suspend it and make sieving easier. There were a few rocks that were cm-sized. Floating organic material is minimal.

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Evaluating a clay's suitability for use in pottery
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