coloring your hair with permanent or semi-perm color will change the color of your hair. You will need to decide when to use John Frieda® Colour Refreshing Gloss Cool Blonde again to get the color and shine effect you desire. You can use this gloss hair treatment anytime between color applications. Make sure you have one hair washing after using this gloss hair treatment before you do permanent color. The shine enhancers may interfere with your color.