White walls in a room might feel crisp and clean, like a blank slate, but if they’re in your workplace, it’s time to repaint. Color not only affects a person’s mood, but it can also hinder a worker’s effectiveness.

In a study from the University of Texas, researcher Nancy Kwallek tested the impact of color on productivity by giving three groups of people clerical tasks to complete in three different rooms, each painted a different color: red, white, and aqua. Some individuals, which Kwallek calls high-screeners, were able to block out the color “noise” of their surroundings, while others, low-screeners, were affected by it. The high-screeners had no difficulty working in the red room, while low-screeners tended to be distracted by the color. Both groups, however, made more errors when they worked in the white room.

“White doesn’t help us be productive, and most work environments are white, off-white, or gray,” says Kwallek, who suggests the sterile quality isn’t conducive to work. Aqua, however, is a good choice. “There have been studies that asked worker preference about environment and color, and the majority felt they liked to work in a blue or blue-green environment,” she says.

Colors can elicit a variety of emotions, affecting the mood and output of your staff. Here are some common paint-color choices and what you need to know to use them properly:

Red For The Detail-Oriented. A powerful color, red stimulates the pulse and can raise blood pressure. A study by the University of British Columbia (UBC) found that red can help increase performance in employees who have detail-oriented assignments.

Blue For Creative Types. Blue is calming. It promotes communication, trust, and efficiency. It also helps people with creativity by opening the mind to new ideas. In the workplace, blue would be a good color in a room that is used for brainstorming, suggests the UBC study.

Don’t Paint Conference Rooms Yellow. The color of optimism, yellow is stimulating. Too much of it, however, can cause anxiety, and studies show that people are more likely to lose their temper in yellow rooms, which might make it a bad choice for conference rooms.