If you dreamed that your friend dyed his hair black: You are about to catch an important opportunity where you can show your competence, knowledge or potential in some subjects. Competitive or challenging environments will not scare you. To see that your friend has dyed his hair black in a dream indicates that this person will take on a pessimistic mood, change his outlook on life, and decrease his enthusiasm for living. If your friend dyes his or her hair, it also means that you will be affected by the bad mood and will be unhappy. There is no good in one's self-regulation.