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  1. Thanks Tom, for this specific details on feldspar. This is so helpful! I got the idea of using potash (from burnt wood) from the s glazes on this ytube video. So I next experiment with making a potash glaze using my garden mix. Unfortunately I do not have access to a kiln, but will try a saggar fire in my shichirin. The picture below is the metal flower pot bucket I used to fire my recent cups.
  2. Thanks for sharing your experience with pitfiring, I watched videos of classes using Shichirin's to fire their tea cups after drying with a hairdryer first. Some cracked others didn't. The artist says Shichirin's can reach over 1000 deg C. I've studied a basic ceramics course, but we used electric kilns which the students had to concentrate on potting and didn't have to attend to the firing science, as the teachers did it all for us. So all my firing is pretty experimental at the moment. Thanks for the using Mica tip, shall check it out. I was informed by a clay stove designer that spodumene was the secret ingredient for thermal shock. My main concern is what is can potash made from ashes, or potash for garden match the qualities of spodumene (lithium feldspar)?
  3. I'm trying to understand Feldspars / Potash and Spodumene to strengthen a homemade paperclay body from thermal shock. Is Potash that I use for gardening and enriching tomato plants the same stuff as POTASH FELDSPAR? Are all Feldspars alike? Does feldspar simply mean potash in ROCK FORM? Does homemade (burnt wood/plants to ashes) POTASH have the same qualities as Potash Feldspar or gardening Potash? I bought some SPODUMENE to add to my clay body to prevent cracking because I will be firing my sculptures with a fire pit of wood and coals. So far all my paperclay pieces have sadly cracked instantly during firing in a metal container. Would Potash (for gardening) do the same thing - prevent thermal shock and strengthen the clay body? Is POTASH (for gardening) actually a Feldspar? Thanks, any advice most welcome!
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