[NeonKitten]

well the best thing i can tell you is to possibly have someoe there with you to make sure it doesn't go much further than your new growth. i'm a cosmetology student and i love color and do may touch ups at school all the time ad my trick is to go to bascially your color "line" and the lightly pull the color through to the old color. if its not bleach or lightner then you shouldnt have a problem with it lifting your previous color as color does not lift color but if it does contain bleach then i would just be careful at how close you are and just go a little past your previous line. hope that helps