The ammonia in hair dye can leave an unpleasant smell that lingers for several hours or even days. Since ammonia is quite alkaline, an acidic substance will effectively remove the unwanted smell. Fortunately, there is an easy home remedy that you can use to remove the odor without ruining the color. As an added benefit, it will improve the health and shine of your hair.
Mix 1 tbsp. of baking soda with just enough warm water to form a paste.
Work the baking soda paste into the ends of your hair, working your way up through the shaft and roots.
Massage the baking soda into your hair for five to 10 minutes.
Mix 1/4 cup apple cider vinegar with 2 cups of warm water.
Rinse the baking soda from your hair with the apple cider vinegar mix. Create and use more of the vinegar solution if necessary.
Wait 15 to 30 minutes for the apple cider vinegar and hair dye smells to dissipate.