Blend Build Root Spray by Jon Renau is the perfect color correcting complement to every wig and topper and is able to be used on both synthetic fiber and human hair. This proprietary formula is offered here in Dark Brown, Light Brown, or choose the combo and get one of each and save money on shipping separately! It's quick, easy-to-use, and convenient for handling when you're on the go. The spray is ideal for blending, and safe for both skin and scalp. Be aware that root spray may permanently dye the fiber or hair. This product is to be used at the discretion of the user and results will vary depending on application method. We recommend covering any lace areas with tape or a thin object like a comb handle to prevent the lace from being dyed along with the hair/fiber. TO USE TO CREATE DARKER ROOTS TO WIGS AND TOPPERS: Shake spray before applying to clean dry synthetic fiber or human hair wigs or toppers Hold can about 2-3 inches from the area you'd like to add rooting to. Start light, you can always apply extra and go darker or broader. Allow to dry for 30 seconds, and then comb through the wig/topper to help blend the color throughout TO ADD A FULLER LOOK TO THIN BIOLOGICAL HAIR: Shake well Section 1/8" of your front hairline or parting areas and spray 2-3 inches from scalp Allow to dry for 30 seconds and comb through TO BLEND BIOLOGICAL HAIR TO A TOPPER: Shake well Spray 2-3 inches from scalp and topper base Spray along where biological hair and topper meet to blend color for a seamless transition Allow to dry for 30 seconds and comb through SIZE: 2.5 fl oz.