IPS e.max Ceram Impulse materials for individual characterization of layering material e.max Ceram. The Opal Effect materials are available in six shade gradations. Starting with Opal Effect 1, with naturally enhanced opalescence and simultaneous high translucency, the brightness value between Opal Effect 2 and Opal Effect 4 is continuously increased. Opal Effect 5  then demonstrates the typical opal shade. The Opal Effect violet material is used to reduce the brightness value in the incisal area.