Minuteman Press in Stow, OH offers one of the best summaries of how color affects buyers:
Whether you know it or not, your buying decisions are oftentimes based on color. The next time you’re looking at an advertisement or packaging for an item you’re considering, pay special attention to the colors you see. Observe how those colors make you feel. Once you understand the effects of color on buying habits, you can make marketing decisions based on that knowledge.