Which is easier to tell apart: blonde and light brown hair or black and dark brown hair?

[calxpal]

Black and dark brown just because I think blonde/light brown shades can appear quite differently depending on the lighting, and have a fair amount of overlap (except light/white blonde).

[Septentrion]

Black and dark brown just because I think blonde/light brown shades can appear quite differently depending on the lighting, and have a fair amount of overlap (except light/white blonde).

You can do the same with black and dark brown hair. The shades appear different depending on lighting.