If you have brown or black hair, Hairprint® will work for you. Hairprint® will NOT work on blonde and red hair. Blonde and red hair contains an additional pigment (pheomelanin) that we do not supply at this time, but these formulas may be developed in the future. A blonde formula should be arriving this summer, so keep checking back! If you have dye in your hair, please read our Transition Tips page before purchasing Hairprint®.