It’s best to re-dye your hair every 5-6 weeks to keep the color vibrant. Those with gray hair should touch up their roots every 3 weeks with a root retouching formula.

The best black hair dye Revlon Colorsilk Beautiful Color Permanent Hair Color, 20, Brown-Black: available at Amazon The inclusion of silk amino acids and keratin makes this ammonia-free dye gentle ...

The Henna Guys 1 Pack Hair Dye: available at Amazon Our take: Mixed with pure henna and indigo, this hair dye is packed with natural herbs and amla powder for added conditioning.