MY experience with 104 has been that if the crack runs straight down the middle then I spent too much time admiring my handy work before sticking it in the kiln.
If I get cracks that squirm this way and that then I used a mixture of glass that I shouldn't have.
But I don't hesitate to add that I have never used anything other than 104 (well, there is a lot of Devardi here that is supposed to be 104 but I still follow the 5% rule with that as well) so YMMV.
Please let us know if you figure it out.
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