In 40+ years of being potters, Gerry and I have never seen this before! Gerry was asked by a student to fire a jug which she said was made of stoneware clay. It has been decorated on the outside but not glazed inside and she asked if a white glaze could be applied - which Gerry did!
He put it into the kiln along with some of his pots and fired it up to 1280C - the whole thing melted. It had been made from earthenware clay! The liquid clay then dripped down through the gaps of the kiln shelves onto any pots that happened to be underneath. It completely stuck onto the pots that surrounded it........
Still, it could have been worse, because the student had asked us to fire a few of the pots but Gerry had only put one of them in!!
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