The roles of reducing agents is that they limit the effect of other substances on the hair while the oxidation agent gains electron by the oxidation of other substances.
The oxidation agents are the substances that reduces given the fact that they are oxidizing agents and also accepting electrons.
The reducing agent on the other hand is one that loses electron and also gets oxidized.
Read more on reducing and oxidizing agents here:
https://brainly.com/question/19599298