What technique is used to color some hair strands darker than their natural color?

The correct choice focuses on "lowlighting," a technique specifically designed to create depth and dimension in the hair by adding darker shades to some strands. This method involves applying a darker color to select strands or sections of hair to contrast with the lighter natural or pre-existing color.

Lowlighting is beneficial for adding richness and a sense of volume, making locks appear fuller and more textured. This technique can enhance the overall look, especially for individuals who may have lighter or more uniform hair color but want to introduce complexity and variation without drastically changing their overall color.

In contrast, highlighting involves lightening certain strands to brighten the overall appearance. Balayage is a freehand coloring technique that creates a sun-kissed, natural effect with soft transitions of color, while ombre represents a gradient effect from a darker root to lighter ends. Each of these methods serves a different aesthetic purpose, and they do not focus on deepening the color as lowlighting does.