Apply your foundation in a color that both matches and evens out your skin tone. For reddish complexions, choose a foundation with a slight golden or yellow undertone. However, even for warmer complexions, remember that the stage lights will tend to wash out or add a 'colder' effect to colors, so go warmer in tone wherever you can to counteract this (unless the character you're playing is meant to be wan, sickly or ghostly, in which case, stick with cold, pale tones!).