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About qwrkygrrl

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  1. Thanks Min! As you surmised, I am not very knowledgeable about glaze chemistry. While I've been working in clay for many years, my focus has been on sculpture and decorative items and have been working with the same glaze for quite a while. Now that I find myself venturing into tableware, I am having to address the issue of food safety and durability. My hope was that I could still use the glazes I am comfortable and familiar with, but it seems that will not be the case. Another consideration is my firing temp. I'm now thinking about bumping up to cone 6 for strength/durability. Since I will need to shift to different glazes anyway, this might make sense. Which program or website did you use to calculate the unity formula for my glaze? I think that could be extremely useful to me as I work though this transition and further educate myself. Thank you again for your patience and help!
  2. How low should the lithium be? Or whatbisnasafe ratio of lithium to silica to make it food safe? I found another glaze that may work, but again, I'm worried about the lithium: Gertsley borate 32 Lithium carb 9 Whiting 17 Neph sy 4 EPK 4 Silica 35
  3. Thanks for your replies… Is there a way to make this glaze food safe or would I have to change the chemistry such that it would be a completely different glaze?
  4. Hi everyone, I have been trying to get a definitive answer to whether or not my low fire shino is truly food safe. Here is the recipe: Lithium carb 26 Neph sy 64 EPK 10 I know that the powdered form of lithium carbonate is considered toxic and precautions should be used in glaze preparation. However once it it fired to maturity (cone 04 for this glaze) it is converted to lithium oxide. I could me misunderstanding, but I have read that in the oxide form, it is safe. Can anyone shed any light on this for me? I love this glaze for its semi-matte texture, beautiful color development, and interesting reactions with other glazes. If it isn't food safe, I would love to know how I could alter it so that it is. Thank you in advance for your help! Sloane
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