Which of the following substances is commonly used as a disinfectant in salons?

Ethyl alcohol is commonly used as a disinfectant in salons due to its effectiveness in eliminating a wide range of pathogens, including bacteria and viruses. It typically comes in concentrations of around 70% for optimal disinfection, as this concentration allows for adequate absorption through microbial cell walls, leading to cell death. It's also relatively safe for use on skin and surfaces, making it a suitable option for salons where hygiene is paramount.

While other substances like hydrogen peroxide and chlorine bleach have their uses in disinfection, they may not be as widely adopted in salon settings compared to ethyl alcohol. Hydrogen peroxide can be an effective disinfectant but has a different application scope and may not always be the first choice for salon tools. Chlorine bleach is potent against germs, however, it can be harsh on surfaces and may not be the best fit for the delicate equipment often used in beauty services. Acetic acid, while it has antiseptic properties, is not typically the go-to disinfectant in salons for general-purpose disinfection. Thus, ethyl alcohol's balance of effectiveness, safety, and efficiency solidifies its status as a favored disinfectant in salon environments.