Which of the following is not allowed in a salon?

Fish pedicures are not allowed in salons due to health and safety concerns. This method involves the use of fish to exfoliate the skin of the feet by nibbling away dead skin. While this practice might seem appealing, it poses significant risks including the potential for the transmission of infections and diseases, as fish cannot be adequately sterilized between clients.

Additionally, regulations in many states, including New Jersey, prohibit practices that compromise client safety and sanitation standards. The use of fish in pedicure services does not conform to these health regulations, making it an unacceptable practice in licensed salons. Conversely, regular pedicures, manicures, and hair coloring are widely practiced within the parameters of state regulations, assuming proper sanitation and technique are followed.