Come payday, blonde employees may find their hair is not the only thing that is light, as a recent poll has found brunettes to be the higher earners.
Brunette women are paid around £4,250 more a year than their blonde counterparts, according to the poll.
Commissioned by hair colour manufacturers Schwarzkopf and Henkel, the survey questioned 3,000 women, 40 per cent of whom said they hated their natural hair colour.
A dye-happy 15 per cent of women questioned said they could not remember what their original shade was.
Camila Lobo-Guerrero of Schwarzkopf & Henkel commented: "It's always assumed blondes have more fun. Our research shows that [they] aren't taken as seriously as women with darker hair - both at work and play."
Another survey conducted by dating site Lycos studied the partners of the world's top 100 billionaires and found that 62 per cent were brunettes, 22 per cent were blonde and not one was married to a redhead.