To darken blond highlights, color your hair with a mix of semi-permanent dye and a developer using the ratio recommended by the dye manufacturer. Brush your hair, and dampen it lightly with water before sectioning it. Apply the dye and developer mixture from root to tip, and let it sit. Wait for your highlights to darken to the desired level, and then rinse the dye out.Continue Reading
Carefully measure the correct amounts of demi-permanent dye and developer as stated in the instructions. This information is often written on the box. Mix the neutral or dark-colored dye with the developer in a dye mixing bowl.
Brush your hair. Dampen it with water to facilitate the application of the dye. Be careful not to wet the hair too much.
Divide your hair into manageable sections.
Use a brush to apply the mixture onto your hair in sections. Apply it evenly from the roots to the tips.
Let the dye sit on your hair for a few minutes until the highlights darken to your desired color.
Rinse out the dye thoroughly. Use a deep conditioner to keep your hair soft.