Separate the yolk from the white of one egg. You can make tempera paint with the leftover egg yolk!
Beat egg whites into a froth with mixer or whisk until you reach the consistency of meringue.
Let the egg whites sit at room temperature for several hours. The egg whites will begin to separate. Then, gently remove the foam from the top of the mixture or pour out liquid glair while holding back foam with a knife. The liquid that remains is called glair. Optional: add a drop of vinegar to help preserve it.
Measure 1 part Earth & Mineral Pigment (we used Terre Verte!) into a mixing container.
Add 1 part glair to the pigment.
Mix with spoon or paint brush until the glair and pigment are fully combined.
Paint away! If you need to thin the glair paint, use water.
Glair paint does not store well, so make enough for one painting session at a time or store in the fridge for up to a few weeks.