Soluble salts on a porcelain mug are causing plucking
Tuesday 27th June 2017
Fired to insight-live.com/glossary/125">cone 10R. The porcelain contains bentonite and a plastic kaolin, both are contributing iron-stained solubles that come to the surface during drying. They tend to concentrate on this foot ring. The solution is to employ a little barium carbonate in the porcelain recipe to precipitate the salts. These could also be sponged or sanded off in the dry state.
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