Define "hair chemistry" in the context of barbering.

"Hair chemistry" refers to the study of the properties of hair and how various products—such as shampoos, conditioners, colorants, and styling aids—interact with hair fibers. This area of knowledge is crucial for barbers as it enables them to understand the composition of hair, its structure, and how different chemical compounds can affect its condition, strength, and appearance. By mastering hair chemistry, barbers can make informed decisions about which products to use to achieve desired results for their clients, such as color changes, texture modifications, and overall hair health. Understanding the chemical interactions also helps prevent potential damage to hair, allowing for safer and more effective hairstyling techniques.