Troubleshooting Calcium in Wild Clay

Dealing with the dreaded calcium spall problem in wild collected clay while teaching a pottery workshop
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0:00 Teaching pottery in the wilds
2:03 What causes calcium spalls
2:58 Stacking the pottery for firing
3:47 How to test for and avoid calcium
4:36 Solving the mystery of where the calcium came from
6:02 Firing the pottery
6:32 How I will test my clay for calcium
7:30 The big reveal, kiln opening

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