We had quite some unhappy results with the dirt that we picked up in the valley of Završnica. The dirt contains probably a lot of calcium carbonate sands, which makes it very liquid when firing on high temperatures. David applied too much of this limestone sand pieces, because he wanted the glaze to flow. Teapot and mugs sticked to the plate and we couldn’t save them. Teapot and two mugs will be ok for our home use.