* Light Absorption and Reflection: Darker hair absorbs more light and reflects less. This contrast between the absorbed and reflected light creates a stronger visual impact, making the hair look shinier. With lighter hair, more light is reflected, and less is absorbed. This results in a more diffused, less contrast-rich appearance, which can make the shine less noticeable.
* Contrast: The difference in light and dark tones within a dark hair shaft and its surroundings creates a greater contrast. This contrast helps accentuate the highlights, making them more visible and giving the impression of more intense shine.
* Perception: Our eyes are drawn to contrast. Dark hair against a lighter background (or with brighter highlights) creates a striking visual effect, which we interpret as shine. Light hair can blend in more easily, reducing the perceived shine.
* Surface Imperfections: Both dark and light hair can have surface imperfections that affect shine. However, these imperfections may be more visible on darker hair. When light hits these imperfections (such as damage to the hair cuticle), the light scatters, creating smaller, more noticeable highlights.
It's important to note that *all* healthy hair can shine, regardless of color. However, the properties described above contribute to the common perception that dark hair is shinier.