What is a primary function of alum in barbering products?

Alum is primarily known for its astringent properties, which makes it particularly effective in staunching bleeding. This is especially useful in barbering when minor cuts or nicks occur during shaving or other grooming processes. The alum acts by constricting the blood vessels, which helps to stop the bleeding quickly.

While some other functions may be associated with different products in barbering, such as moisturizing or binding, the standout role of alum in this context is its ability to control bleeding efficiently and promote healing of small wounds or irritations on the skin. This makes it an essential tool in the barber's kit, as safety and comfort for clients are paramount during any grooming service.