I have been told that variation in thickness in the piece combined with drying speed can cause warping. So if your bowl has a thick base and thin walls you should dry it slowly so that it is drying as uniformly as possible. You can expose the thicker areas to more air and keep the thinner areas more covered. If you think about the bowl as a spiral or spring you can imagine how it might "untwist" itself in certain conditions. (Drying rate is why handles can pop off mugs too, the handle dried faster than the cup). I don't know why it is more noticeable after glaze firing thoughn but I've had the same thing happen.

👍 can you leave them at the desk for me? Also, if you want to hang on to them until next semester to try them that's fine with me!

I saw a blue shrink ruler in with the community tools on Saturday night- did you poke around that shelf?

I put them on your shelf!

Next time I'm in I'll leave them for you! Do you have a shelf?

I have a metal set of typewriter letters and cookie stamp letters. I haven't had a chance to really experiment with them, but I'm happy to lend them for you to check out and see what you think.

Diamond Core tools are quite expensive but they come with replacement blades- I use one of their tools almost exclusively for trimming.