One thing that you may love about your marble is the stark contrast between the dark iron lines and the white stone. White and black interiors are quite popular at the moment, but black, white, and gray marble come with a few crucial elements of consideration. Homeowner Julie, who has ample experience with marble in bathrooms, explains, “The iron in the marble oxidizes and turns brown/orange/yellow when it has a lot of water exposure, and showers, in particular, are most susceptible to this color turning.”