Dealing with the dreaded calcium spall problem in wild collected clay while teaching a pottery workshop My pottery workshops and classes https://ancientpottery.how/classes/ Subscribe to my newsletter https://ancientpottery.how/subscribe/ 🏺 Wednesday Zoom pottery class - https://ancientpottery.how/ancient-potters-club/ ❤️ Channel membership - null 🛍 Shop my website: https://ancientpottery.how/shop/ 📚 Workshops and masterclasses - https://ancientpottery.how/classes/ ⭐️ Social media Facebook - https://www.facebook.com/andywardpottery Instagram - https://www.instagram.com/ancientpottery/ 📬 Send me mail Andy Ward PO Box 43601 Tucson, AZ 85733 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 As an Amazon Associate I earn from qualifying purchases.