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A customer said this about Val Turquoise glaze recipe: "I’ve noticed the alumina is below the suggested limits in the original and my modified version. I have also read that too low alumina can cause a glaze to be more prone to leaching, especially with the addition of copper carb. I’ve soaked samples in vinegar and lemon juice. I’ve also run pieces through the dishwasher several times with no visible changes."
An additional observation is that the thermal expansion is high enough that it could craze on many bodies.
Her final comment: "I never want a customer coming back to me with a faulty pot. I just want to do everything within my power to make the best pot that I can which includes a durable, reliable and functional glaze."
There are people out there like you who care about these sorts of things and are making real use of the potential that Insight-live provides.
Buy me a coffee and we can talk