Do actors dye their hair in the color for the role that he or she will playing in the movie?

Well sometimes the actor will be required to dye their hair and sometimes wigs are applied and sometimes hair color spray is applied to the actor's hair. It all depends on what is in the contract for the actor and director. Now it is a known fact that some actors have to either: Put on weight for the job, or lose weight, and some even have to bulk up in muscles for the job. It really all depends. And no, your question is not stupid because many people don't know.