For best results and ideal application, you first need to identify the lightest shade of your hair. For example, if you have vivid highlights or streaks on blonde hair, use a blonde gloss hair treatment. A blonde gloss is also recommended if you have black hair and blonde highlights, as it refreshes your highlight and provides shine on your black hair. If you would like to refresh mainly black hair, you can use a black gloss. In that case, your highlight may become slightly darker and bluish. If your highlights become too dark, stop using this black hair gloss. Then wash hair with your regular shampoo or a clarifying shampoo. The color deposit from the gloss will wash out over time if you discontinue use.