I had some dark red facial hair with dark and white mixed it. The laser technician was unsure the laser would work on the dark reds, her experience was sometimes it does, and sometimes it doesn't. The more fair skin you are the more likely it will work. Fortunately for me, it did work. I still have some white hairs left, they aren't noticeable until the morning of my electrolysis appointment which fortunately is at 8am in the morning on Thursdays. Laser easily knocked away 60% or more of my facial hair.