The tempera or gouache, cover is a painting that is diluted with water and dry quickly. The most common supports are paper, cardboard or wood. The tempera painting is made with powdered pigments with a mortar and hand dry egg yolk (which makes binding agent or principal medium), sometimes together with other materials such as honey, water, milk (casein ) and a variety of vegetable glues. The tempera painting is usually applied in thin, transparent or semiopaques layers. When dry, produces a smooth matte finish. Because it can not be applied in thick layers such as oil paint, tempera rarely deep saturated color as in the oil. Moreover, the colors of tempera paintings do not change with the passage of time, while oil paintings darken.


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