
I was asked if egg was mixed into egg tempera. The answer is, yes, there is egg mixed in. Some artists make their own. I buy it already made up in tubes. The brand I use is Sennelier Egg Tempera; which is famous as "the brand and medium used by Marc Chagall in many of his most spectacular works. Egg tempera is a water soluble and highly archival painting medium, wonderful for fine art painting, restoration, and icon painting. It's perfect as an underpainting for oil painters. Sennelier egg tempera is based on a centuries old recipe. It consists of an emulsion made from vegetable oil, plant resin, egg yolk, and distilled water, as well as an anti-mould agent.Sennelier egg tempera has working qualities and a finish that is only found in authentic egg tempera made in the traditional manner. These delicate colors hold their brush strokes, and do not change when dry. Egg tempera can be worked with a brush or a palette knife (diluted with water) on non-greasy supports like acrylic primed canvas or paper."
I prefer the convenience of the tubes and the tubes store well vs. the few days you have to use the stuff you mix yourself. To make your own tempera: you mix dry pigment and albumen (egg yolk free of the encasing part). Tempera made with only an egg yolk is not as workable a painting medium as an egg-oil emulsion. The addition of a small amount of stand oil improves the handling properties and increases the resistance to cracking so that the paint film can be made thicker. Most of the egg tempera paintings in museums were painted with the addition of oil. This preceeded painting in oil alone. Some purists are driven crazy about tube egg tempera in much the same way as some watercolor purists are driven crazy by an artist using anything but watercolor paints in a watercolor painting. I like to experiment and will use anything to accomplish the ends as long as it is sound archivally. And, I figure if Chagall used it...