Employees have revealed they get depressed when they work in an office that is painted blue.
Yellow offices made staff feel happy, energised and more focused on their work.
Employees said they felt angrier and more passionate if there was more red than any other colour, while black made them feel "tougher."
The research by Konica Minolta also found that grey offices made workers feel "dull."
A spokesman from the company said: "This study shows that it is not just Monday mornings, the rush hour or having to work late that can affect the office environment - colour has a huge impact."
