Final answer:
The term for the balance or hue of color seen in hair is hair coloring, which is determined by melanin and can change over time due to varying levels of eumelanin. Other factors influencing hair color include saturation and value.
Step-by-step explanation:
The balance, or the hue, of color seen in the hair is referred to as hair coloring. Hue refers to the color itself when we talk about hair. The pigment melanin, which includes two types, eumelanin and pheomelanin, determines the color of hair and skin. In hair coloring, the amount of eumelanin present can make the hair appear darker or lighter. Over time, the levels of melanin can change, causing hair color to change.
Additionally, saturation plays a role in hair color, referring to the intensity of the color. When hair color is fully saturated, it appears in its purest form. Lastly, value changes when black or white is added to hair color, making it darker or lighter, which is often used for artistic effects such as shading or highlighting.