In chemical services, what function does a developer serve?

The developer plays a crucial role in chemical services by activating the color or lightener and facilitating its penetration into the hair structure. When used with hair color or lighteners, the developer works by opening the hair cuticle, allowing the dye molecules to enter the hair shaft. This process is essential for achieving the desired color change, whether it is through deposit-only color or through a lift with lightening products.

While some might think of moisturizing or conditioning effects, those functions are not the primary purpose of a developer. Additionally, while developers can influence pH levels, that is more a characteristic of the specific type and strength of the developer used, rather than a direct function of it in chemical processes. Understanding the role of the developer is key in ensuring effective results in color treatment and lightening services.