I had something weird happen yesterday while baking some items in cornstarch. I have a baking pan that is filled with cornstarch, probably 3/4 inch deep, and I bake in it regularly. I use my kitchen oven for curing, and use an oven thermometer. The pan is covered with foil while baking. Yesterday I put some pendant focals in along with three little cat figurines, which I laid flat on their backs on top of the cornstarch. The pendants were thinner than the cats, and I removed them after about 40 minutes. All was well. I left the cats in for another 20, for a total of about an hour, which is what I normally do. I let them cool in the pan while I did other things, and came back later to rinse the corn starch off. When I rinsed them, I realized a thick layer of cornstarch was stuck to them...hard. I ran them under water and rubbed at them to removed the cornstarch, and, as I did so, the cornstarch started flaking off and taking the surface clay with it! Now the little critters are all pitted and broken, and one of them has a large cracked layer that looks like it's going to break off at any time.
I've NEVER had this occur before, and wonder if anyone else has had anything like this happen. I've baked these little guys using the same method for years without incident. And the pendants, which were in the same pan, are absolutely fine. Anyone have any ideas?