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Used as a flocculating agent in glazes (to suspend and gel them). It works well with glazes containing bentonite or carbonates. This material is the key to being able to apply a glaze to non-porous porcelain bisque ware, the slurry stays in place after application because of the gel state.
Usually small additions (.1-.3%) added to glaze slurries are sufficient to produce gelling. But sometimes higher, or considerably higher, percentages are needed (which may be an important consideration if small amounts of epsom salts would work).