A clay composition for use in slip casting comprises: a) a major amount of at least one kandite clay; b) a minor amount of an organic additive comprising at least one water-soluble compound having a plurality of basic groups; and is characterised by also including c) a minor amount of at least one non-calcined smectite clay. Also disclosed is the use of the clay composition together with a slip medium, eg. comprising water, to form a slip coating composition and the use of such a composition in producing slip cast ceramic articles.
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