Instructions: How to Use: 1) For all over lightening, spray generously into damp hair and comb through evenly. For a sun-streaked look, just spray the strands you want highlighted. 2) Sun-In is heat activated. Let the sun do the work or use a blow dryer. 3) Wait for hair to dry. Repeat above steps until you get the highlights you want. Before using, test a strand of your hair and follow all label instructions. Recommended for blonde to medium brown hair. Reddish results may occur in dark hair. Not recommended for color-treated or chemically treated hair.