Simplify the following text for a Grade 7 native English-speaking person.
Original: Tempera , also known as egg tempera , is a permanent fast drying painting medium consisting of colored pigment mixed with a water-soluble binder medium ( usually a glutinous material such as egg yolk or some other size ) . Tempera also refers to the paintings done in this medium .
Simplified: Tempera ( sometimes known as egg tempera ) is a type of artist 's paint .