Water-Based Pigments, ContinuedGouachecharacteristicsGouachestorageGouachefinishingCaseinCaseinpermanenceCaseincharacteristicsCasein storageGouache is opaque and chalky in appearance. Gouache should be applied inthin layers; otherwise, thick layers may become brittle and crack. Gouacheis ideal for large areas of solid color and for small detail. Gouache in lightcolors dries darker than when wet. Gouache in dark colors lighten as itdries.You may store the gouache for short periods in an enclosed palette with amoist sponge or paper towel inside if you finish painting and have pigmentleft over. The moist sponge or paper towel will release moisture in the airallowing longer storage periods.Gouache has a matte surface and does not require any special finishingtechniques.Casein is a water-based pigment made by combining a milk derived emulsionwith oils, a stabilizer, and pigment. The formula for creating casein variesfrom manufacturer to manufacturer.Therefore, it is wise to select onebrand of casein and use it exclusively.Casein is a relatively permanent pigment that is not rated by degrees ofpermanence. Casein is centuries old with only recent emulsion refinements.Casein is not fluid like watercolor and gouache and not flexible like acrylics.Casein is water soluble when wet but, water proof when thoroughly dry.Casein is opaque with some amount of white added to each color. Casein isbrittle and will crack when applied in thick layers.Casein does not store well. Cheaper brands of casein lacking sufficientfungicides and stabilizers tend to mold and decompose. You should preparethe amount of casein you expect to use in one sitting. Clean your brush oftenduring a painting session. Scrape excess paint from the palette andthoroughly clean the palette before putting it away.Continued on next page1-59
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