Today I tried making egg tempera paint for the first time. The binder is just an egg yolk, completely separated from everything else, and to prevent mold a small amount of 70% rubbing alcohol was mixed in. I made five paints- lemon ochre, Venetian red, Nicosia green earth, ultramarine blue, and titanium white. Except for the white all of the pigments were from Natural Pigments.
The paint was very nice to work with, but tended to form a dry skin over it on the palette very quickly and things got a little rushed in an effort to finish the painting adequately before running out of useable paint.