Be aware that blue may turn out greenish on blond hair, and brownish on brassy hair. If this bothers you, tone your hair to a more neutral color.
If you want, you can buy a nylon cape, like the kind used in salons, from a beauty store. This will protect your clothing.
For a permanent option, use 2 tablespoons (30 milliliters) of developer instead. [1] X Research source
For a permanent option, mix 1 tablespoon of food coloring into the developer. [3] X Research source
You can also mix up a separate pale blue (for brassy tints) or pale purple (for yellow tints) dye, and use that in your hair first. After you wash and dry your hair, you can dye it the color you want.
If you want highlights, apply the dye to thin sections of hair. Wrap each section with plastic wrap or aluminum foil to keep it separate. Don’t dye all of your hair. Another way to add highlights would be to poke holes into a shower cap, put the shower cap on, the pull strands of hair through the holes. You can even buy shower caps with holes from beauty stores for this purpose.
If you don’t have a shower cap, try plastic wrap or a plastic bag. Secure it with plastic hair clips.
If you are using a developer for a more permanent option, let it sit for about 40 minutes. [9] X Research source The longer you leave the dye in your hair, the deeper it will be. If you want a lighter color, leave it on for a shorter period of time.
Temporary dye jobs will start to fade with each wash. They should last about 2 weeks total, depending on the color and your hair type. [12] X Research source Some dye jobs may come out after only 2 to 3 washes. [13] X Research source Permanent dye jobs will last about 3 weeks before they start to fade. [14] X Research source
