Consult with a hair color professional, if your stylist left you with an undesirable color. Professional stylists can apply a product to hair that removes the permanent dye. Returning to the same stylist that caused the issue is helpful, as she knows exactly what she put on your hair and will likely know best how to resolve the issue.
Call the hair color manufacturer, if you applied the dye with an at-home kit. The manufacturer is familiar with the ingredients found in its specific hair dye and will likely know the products that can counteract those found in the dye.
Apply a semi- or demi-color to your hair, if recommended by the at-home kit manufacturer. Semi- and demi-colors will likely cover up your hair atrocity. Most are applied in the same manner as you applied the initial product. Choose a color that is similar to your natural hair color or what you had before you applied the product that created the hair disaster.
Use shampoo designed to remove chlorine from your hair if it has turned green. Doing so may remove the undesirable hue.
Attempt to resolve the hair issue within 48 to 72 hours of applying the color.
If left untreated, the hair color will likely fade or resolve on its own.
Dark colors are typically harder to remove than those that are lighter.
Shampooing your hair with hot water will help to fade the hair color.