Ohio Cosmetology License Practice Exam

Petroleum jelly is often used as a barrier during chemical services due to its occlusive properties. It creates a protective film that prevents chemical products from coming into contact with sensitive skin areas, such as the hairline, ears, and neck, where irritation or chemical burns might occur. This is particularly important during processes like hair coloring, perming, or relaxing, where strong chemicals are used.

Using petroleum jelly effectively minimizes the risk of adverse reactions while allowing the chemical service to be applied safely to the hair. Other products like conditioner or styling gel do not provide the same level of protection; conditioners are typically meant for moisture retention and may not create a strong enough barrier, while styling gel is designed for hold and setting styles, not for protection against chemicals. Aloe vera gel, although soothing, does not form an effective barrier for chemical protection either. Therefore, petroleum jelly is the most suitable choice for serving as a barrier during such services.