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  1. Wollastonite being better than whiting because it has less LOI is just a myth... Even at cone 6, cones are designed to measure the last 100 C of the firing for a reason, below that point, they just don't melt. If you can prove (scientifically of course) that a single material melting is going to trap gasses from whiting please publish it and let me know. Common sense tells me that it won't, even if that material is 30% of the recipe, as long as there's room for the gasses to escape (and there is, you can check the article Melting behavior in Traditional ceramics) this shouldn't have any effect on the result. I'm not saying that I'm right and you are wrong.. but I think that some statements should be taken with a grain of salt, because they are not proven, and when you have a problem like the op has, this wouldn't be the first thing I try. So going back to the OP's problem. I see a very strange color in your test tile, did you add a colorant to the recipe that you didn't tell us about? Are you sure your kiln reached temperature (did you use cones)? If you only have problems with this material, have you tried using it in other glaze recipes? Maybe you just got a mislabelled batch (this has happened to me before). Those bubbles really look nasty. Look at this picture from Derek Au (creator of glazy): same glaze... using whiting, no bubbles or pinholes.
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