Yes!
I have just never had that problem. All of my low fire pottery have been Kiln baked. I do realize the Indians used to make really low fire clay pots in pit fires and still do for shelf items. Maybe they were Southern Indians in areas like Mexico? I would imagine that modern day manufactures would be doing them in a kiln and not in firepits. I would imagine at least cone 06-012? Its worth researching for those interested. I'll bet the company would let folk know if contacted;... and would be happy to answer questions from a prospective buyer!
