What service requires barbers to have knowledge of chemical interactions?

Hair coloring is the service that requires barbers to have a solid understanding of chemical interactions. This knowledge is crucial because hair coloring products often contain various chemicals that can react differently depending on hair type, texture, and the existing color. Understanding these interactions helps barbers choose the right products and techniques to achieve the desired results while minimizing damage to the hair and ensuring the safety of the client.

For instance, a barber must be familiar with how different hair dye formulations interact with the natural pigments in the hair and how to mix these products appropriately. Additionally, knowledge of potential allergic reactions and the appropriate use of developers and activators is essential to prevent any adverse effects.

In contrast, services like hair cutting, shaving, and beard trimming mainly involve the use of tools and techniques without the complexity of chemical reactions. While these services require skill and technique, they do not necessitate the same level of understanding regarding chemical interactions that hair coloring does.