What is the material used in the faux painting trompe l'oeil?

You can use any type of paint to do trompe l'oeil. It is the technique, not the paint, that creates the illusion. Proper use of dark and light, gradations of color, and perspective all come together to ';fool the eye';.What is the material used in the faux painting trompe l'oeil?
Words literally mean, ';fool the eye'; into thinking the painted objects are real, in front of a background.