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They're advertised as temporary and semi-permanent dyes, but metallic dyes are anything but. They layer on gradually; the more you use, the more intense the color. But they don't come off quite so easily. Metallic dyes leave traces long after the color has faded. The problem? When another chemical such as hair color, perm solution or a relaxer comes into contact with the traces, the hair gets super heated and melts -- it falls right off. You must remove metallic dye completely before any chemical service or risk losing your hair.
Get your hair cut; it's the best thing that you can do to remove the metallic dyes completely. Go as short as you dare. Take it off above the dye job to be certain you can perm and color again. If you don't want to go short, you can clarify, but you can't get chemical services.
Shampoo your hair with clarifying shampoo twice a week. Leave the shampoo on for at least two minutes before rinsing. Follow up with a good conditioner, though. It might dry your hair out.
Perform a clarifying treatment -- one indicated for metallic dyes -- once per week. Mix up the treatment with 1/4 cup warm water. Work the treatment through your freshly shampooed hair. Put on a plastic cap and set a timer for 15 minutes. Heat up the outside of the cap for the duration with a hand-held blow dryer set on medium heat. Remove the cap, rinse and condition.
Trim your hair regularly to remove the dyed ends from your hair. As your hair grows, you will trim away all the hair still affected by metallic dye.
Pick up a good clarifying treatment at your local beauty supply. Read the label; it should specifically mention metallic dyes on the packaging. If not, ask for help. The staff at beauty supply stores is knowledgeable about the products and can point you in the right direction.
Do not attempt to color, perm or relax hair that has metallic dyes in it. Even after several clarifying treatments, you can't be sure that all of the trace elements from the dye are gone. Either cut off all the dyed portions of your hair before you attempt altering your hair chemically or go without. Even if you can't see them, metallic dyes can make your hair melt when mixed with another chemical.