What process happens during the color development time?

During the color development time, the correct process involves the formation and bonding of color molecules to the hair shaft. This is a crucial phase in the hair coloring process, as it allows the dye to penetrate the hair cuticle and interact with the cortex, where the color ultimately takes hold.

As the developer activates, it opens the cuticle of the hair, allowing the color molecules to enter. Once they are inside, these molecules undergo a chemical reaction that causes them to bond with the hair proteins, resulting in a lasting color change. This bonding process is essential for the longevity and vibrancy of the hair color.

Other processes mentioned, such as hair fibers shrinking and expanding, hair color washing out, or hair becoming more porous, do not accurately describe what occurs during the development time. Instead, they relate to different aspects of hair texture or color maintenance rather than the chemical bonding necessary for effective coloring.