I recently glaze fired this vase, and thought it came out of the kiln fairly well.
There was initially only some crazing on one of the glazes I used, which didn't concern me, as it was a decorative piece.
However, several hours later, when I looked at the vase, these cracks had appeared. Obviously, they are very much structural.
My first thought, is that they are stress cracks, that just didn't show up earlier in the process. As you can see, one of them follows the curve, where the body meets the neck. I had a bit of an issue with this area, when throwing. It really wanted to "flop". I'm guessing, this is where the initial structural problem arose.
I've just never had something crack this long after unloading it from the kiln.
I plan to make a vase using a similar glaze combination in the near future. So I'm trying to figure out if it was just a clay structure issue, or if the glaze fit, could have caused a crack this badly in the clay body?