Choosing a grout that is darker in color helps conceal dirt and is less likely to change in color as quickly as a light colored grout. It can also enhance the look of the bathroom, helping light tiles to look even lighter. Dark grout against a light tile can help the look from being too washed out and can help anchor the white and provide some substance to the look.
Dark grout is not without its own set of issues though. While it is not necessary to clean it with the same attention to detail as you would with white grout, it is necessary to wipe it off very regularly. Dark grout can lose its color when cleaned with products that are too harsh or with tools that are too abrasive. Once the color is impacted, it is difficult to bring it back to its original luster.
Using gentle cleaning products and adding a color seal to dark grout can help maintain the color longer.
MORE GROUT INFO ON APARTMENT THERAPY:
• Tips for Choosing Grout: Tiled Bathroom & Kitchen Floors