generally used for any mixture of an inert white pigment with glue, used as a ground for painting; strictly, a mixture in which the inert pigment is calcium sulfate. Gesso grosso is coarse gesso made from sifted plaster of Paris, used for the preliminary ground layer in medieval Italian panel paintings. Gesso sottile is fine crystalline gypsum, made by slaking plaster of Paris in excess water. Gesso can also be built up or molded into relief designs, or carved.
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