A look at what is currently available on eBay
 OTAGIRI Stoneware China HORIZON Set 6 Dinner Plates US $34.99 
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 STONEWARE WHEAT FLOWER AUTUMN COLLECTION 7 DINNER PLATES $5.99 EACH US $5.99
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 Stoneware dinner plates- double black rim (2) US $10.00
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What is the oily stuff coming out of my Pfaltzgraff stoneware?
I noticed some of my new stoneware dinner plates were not drying properly in the dishwasher and out of curiosity placed them in a hot oven for a few minutes. To my surprise, they were 'sweating' an oily liquid and after a few more minutes they looked as if you burned cheese in them. Very weird. I noticed that some fine dark veins on the glaze, disappeared after this heat treatment.. The liquid being sweated out was coming out through these veins. After putting them through dishwasher again, they noy come out clean and dry. What could it be?
It sounds a bit like some of the homemade pottery my daughter brings home from college before its been washed. I wonder if it was properly baked in the kiln. I would try washing them by hand with hot, soapy water and something rough, like a scotch brite. If they still are "sweating", not water proof, or imparts a funny taste on the food, it I would take them back to the store.
It sounds like they may be porous and thats not good if you going to eat off them on a daily basis. Are you sure these were meant to be used as dinner plates and aren't meant to be decorative? (i.e., plate liners or just to look at).
If you decide to keep them, you may want to check for lead. Its a long shot but lead poisoning is nasty stuff.
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