Review Of Best Hair Color When Going Gray Ideas. Web depending on the thickness of the color or length of the hair, one of martin’s gray hair transformations can take anywhere from six to 14 hours. Covering gray means you can get creative.

If you’re the type of gal that wants to cover those roots but. Thus, dyeing your hair black to transition to gray seems totally counterintuitive. Lavender is a top contender for the best hair color for gray hair.