The Makeup Used in Tron: Legacy

The purpose of the Sirens in Tron are to provide the programs with armour before heading into gladiatorial games. "Originally, the Siren characters were all supposed to have been created equal and identical, but that wasn't possible because actresses with different skin shades were cast," explained Rosalina. "I decided to exaggerate their skin tones and take this contrast to the extreme by making some Sirens many shades darker and others much lighter than their natural skin colors," she added.
Photo courtesy of Disney