What should you use to protect the scalp during hair coloring?

Using a barrier cream to protect the scalp during hair coloring is essential for several reasons. Barrier creams are typically formulated to create a protective layer on the skin, which prevents the colorant from coming into direct contact with the scalp. This is particularly important as hair dyes often contain strong chemicals that can cause irritation or allergic reactions if they touch the skin.

Applying a barrier cream not only helps prevent discomfort but also ensures that the hair color is evenly applied to the hair strands without affecting the surrounding skin. This is especially important in professional settings where a clean aesthetic and the comfort of the client are priorities.

In contrast, other options do not provide the necessary protection. Plastic wrap is not suitable as a protective measure against chemical irritants; it doesn't form a barrier that prevents chemical absorption. Shampoo is designed for cleansing and would not offer any protective benefits during the coloring process. Water would not create a barrier and could even dilute the dye, leading to undesirable results. Therefore, using a barrier cream is the most effective way to protect the scalp during hair color application.