Red foils in dark brown hair is a hair coloring technique that adds thin streaks of red color to dark brown hair. This technique creates a subtle, yet striking contrast between the two colors, adding depth and dimension to the hair.
Red foils have been used for centuries to add color and style to hair. In the past, natural dyes were used to create red highlights. Today, there are a variety of chemical hair dyes that can be used to achieve this look.