Name one type of chemical service commonly performed by barbers.

Hair coloring is a commonly performed chemical service by barbers, making it a valid and important aspect of their skill set. This service involves the application of various chemical products to alter the color of hair, providing clients with options to refresh their look or cover gray hair. Hair coloring requires understanding the chemical processes involved, including the use of oxidizing agents and dyes, as well as knowledge of how different hair types react to these chemicals.

While hair straightening is also a significant chemical service offered in the industry, hair coloring encompasses a broader range of techniques and styles, appealing to more clients seeking cosmetic changes. Additionally, beard dyeing, while popular, is more specialized and may not encompass the full range of chemical services that barbers are trained to perform. Therefore, highlighting hair coloring effectively captures a fundamental aspect of a barber's role in hair care.