Buy two packs of dye: Even if your hair is medium length.; Choose the dye on the skin: If your skin is sensitive, it is best to do a dye test on an area of the scalp to see if you will experience an allergic reaction.; Apply Vaseline to your hairline: To protect your face and skin from staining.; Comb your hair: Make sure to detangle your hair before you start dyeing your hair.; Section your hair.; Mix the dye.; Start distributing the dye: Using an old comb.; Use a toothbrush: Use an old toothbrush or mascara wand to dye the roots.; Leave the dye on your hair.; Wash your hair properly.; Harmful effects of ammonia: Damage to the outer hair cuticle.; Scalp burns.; Dry hair.