Wyoming State Board Cosmetology Practice Exam 2025 – All-in-One Guide to Exam Success and Mastery!

Bleach is the most common method of hair lightening because it contains strong lightening agents, primarily hydrogen peroxide and ammonia, which effectively strip color from the hair. When applied, bleach penetrates the hair shaft and removes the melanin pigment responsible for the hair's natural color. This process allows for significant lightening results, making it a popular choice among hairstylists and individuals looking to achieve blonde shades or to prepare hair for additional color applications.

Each of the other methods mentioned has its own effects and limitations. Hair dye generally deposits color rather than lightening it, highlights can refer to a technique of adding lighter shades to the hair rather than uniformly lightening it, and lemon juice has a natural but much weaker lightening effect that may take longer and depend heavily on the sun for activation. In comparison, bleach provides a quick and potent solution for those seeking pronounced lightening.