It's fine if your hair is moist, as long as it's not too wet. If it is excessively moist, the color may be diluted. 6. Before applying indigo paste, some individuals like to massage their hair with a few spoonfuls of baking soda. This helps remove any residue from previous colors or treatments. 7. Once you have mixed your indigo color, apply it to your hair in sections using a wide-tooth comb. Work from root to tip for best results. Allow each section to remain in the dye for five minutes. Then rinse thoroughly under warm water. 8. After rinsing, wrap your head in plastic wrap or put it in a bag for ten minutes to help set the color. Remove and wash your hair regularly with mild shampoos to keep the color vibrant. 9. To restore lost color, use a mild reducing agent such as sugar or salt. For a stronger reduction, shave off some hair (using clippers is best for precision) and apply the indigo color again. Continue shaving off small amounts each time you color your hair until all of the red pigment has been removed. 10. When coloring hair, it's important to avoid contact with skin because the acid in blue dye can cause irritation. If you must take care of your skin, use a gentle cleanser and moisturizer after washing your hair.