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Definition: tempera from Philip's Encyclopedia

Painting medium used extensively during the Middle Ages, made of powdered pigments mixed with an organic gum or glue, usually of egg white or egg yolk. Tempera dries quickly and is applied with a sable brush, one thin layer on another, so that the finished effect is semi-opaque and luminous. During the 15th century, the more flexible medium of oil painting began to replace tempera.

Summary Article: tempera
From The Hutchinson Unabridged Encyclopedia with Atlas and Weather Guide

Painting medium in which powdered pigments are mixed with a water-soluble binding agent such as egg yolk removed from its sac. It is noted for its strong, translucent colours, and can be thinned with water. In use before the introduction of oils, a form of tempera was used in ancient Egypt, and egg tempera was the foremost medium for panel painting in late medieval and early Renaissance Europe. It was gradually replaced in popularity by oils from the late 15th century onwards.

As some of its ingredients are organic, tempera may spoil and smell, although adding products such as salt and soap can help reverse or halt the growth of bacteria.

Pure egg tempera In pure egg tempera well-ground inorganic pigments are mixed with egg yolk and water and painted onto a slightly absorbent gesso panel (a form of white plaster). Only the yellow yolk of the egg is used, as this bleaches out whereas the white of the egg may turn brown.

In early Italian painting, the initial lay-in of a design was often done with terra-verte, a greyish-green pigment. Colours were then applied to the design in a mixture with flake or zinc white, gradually being strengthened and modelled with glazes or hatches of pure transparent colour.

Tempera emulsion Tempera emulsion uses for its medium a well-fused mixture of egg yolk and stand oil, which allows it to be diluted with water. It dries hard sooner and, being more flexible, can be used on canvas prepared with gesso, a white, smooth medium made of a calcium-rich substance such as gypsum and glue. The early Italian procedure is described by a pupil of Giotto, Cennino Cennini.

Casein Casein is a variant of egg tempera in which the medium is fresh white curd and a little slaked lime, diluted with water.

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