Slip

An opaque, creamy liquid made by mixing finely ground clay with water. Slip is an inevitable byproduct of working on a potter's wheel, its name having resulted from potters' use of water to keep the spinning clay slippery as it's worked. Slip is also used in the making of pottery to cement together parts that have been formed separately; in slip casting, and in decorating surfaces. (Artlex.com)

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