Quick Tips: Black Plastic Exit Signs Can Look Better Than White Exit Signs On Non-White Walls.Most people purchase plastic exit signs with white housings. However, if your space has walls that aren't white and you want something more subtle, consider a simple switch to black housings. Besides less color contrast, without the shiny gloss, black plastic exit signs also don't immediately look plastic. Black plastic exit signs look similar to their upscale cousins, the black cast aluminum exit sign; It's often difficult to tell them apart when they are installed. The effect works well, especially for ambiances that wish to evoke a mood. Most of the time, the cost to upgrade to black is just a few more dollars per sign. Is it worth it? You can see for yourself by looking up the next time you are in a Starbucks, they typically choose black exit signs. Black Exit Signs