
I am frequently asked the question "what is tempera?". Even most of the artists I know think it refers to what is called poster colors.
Tempera is an artist's medium dating back to the panes and illuminated manuscripts of the Byzantine world and the Middle Ages in Europe. This paint is made by binding pigment in an egg medium, along with other materials such as honey, water, milk and plant gums. It was the most widely used technique until about 1500, after which it was gradually replaced by oil paint.
Italy, Greece, and Russia were the major centers of tempera painting, and even in the present day, it is used to render the Orthodox Icons.The tempera technique was briefly revived in the nineteenth and twentieth centuries in Western art, among the Pre-Raphaelites and Social Realists.

Tempera paint dries rapidly. The techniques of tempera painting can be more precise when used with traditional techniques that require the application of numerous small brush strokes applied in a cross-hatching technique. The colors, which are painted over each other, resemble a pastel when unvarnished, deepening when varnished.
Tempera is normally applied in thin, semi-opaque or transparent layers. When dry, it produces a smooth matte finish. As it cannot be applied in thick layers, tempera paintings rarely achieve the deep color saturation of oil paintings. However, tempera colors do not change over time, and do not darken, yellow, and become transparent with age as oil paints do.

True tempera paintings are quite permanent, and examples from the first centuries AD still exist, such as the Severan Tondo and some of the Fayum mummy portraits.
Tempera is a an easily manufactured, non-toxic, eco-friendly medium.
See how you can make some of your own.