temper the gypsum plaster

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building construction — Techniques and industry involved in the assembly and erection of structures. Early humans built primarily for shelter, using simple methods. Building materials came from the land, and fabrication was dictated by the limits of the materials and… … Universalium
tempera painting — Painting executed with ground pigment mixed with a water soluble material, such as egg yolk, gum, or wax. The special ground for tempera painting is a rigid wood panel coated with thin layers of gesso, a preparation usually made of plaster of… … Universalium

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