Pre-Mixed, Color Additive, and Colorants:
Most homeowners doing their own tiling choose to purchase dry-mix or pre-mixed grout with the color already added in.
Alternatively, separate color additive can be mixed to the dry or pre-mixed grout to achieve any color. Because it is difficult for non-professionals to effectively add pigment to grout, most DIYers choose grout with the color already mixed in.
Lastly, grout can be colored later after it has hardened with colorant.
Tip: See Video on How to Grout Tile
Popular Grout Colors:
The most popular grout colors are gray and off-white. Few homeowners take advantage of the fact that grout comes in a myriad of colors besides gray and off-white.
Mapei Corporation, a major supplier of tile-related materials, has grout in 33 colors. Laticrete has 40 grout colors.
Few truly vibrant grout colors are available. Many grout colors fall in the earthen-toned color spectrum. A dull orange is about as colorful as most grout will get. With Mapei, this orange is called Cinnamon. With Laticrete, this hue is called Cinnamon Spice.
Pure White Grout Gives You the "Grid Look":
It may seem like a good idea at the time to use pure white grout, but it will give you problems later on down the road. Not only does white grout get dirty quite fast, but when it is still white it does not look natural. The contrast between the tile and grout can be too striking. The grout lines overpower the color of the tiles, presenting a kind of grid-like appearance.
Dark Grout, Lighter Tile:
When the tile is light and the grout is dark, then the grout becomes a design element that you need to consider. When the contrast is too much, then you end up with an unpleasant checkerboard look.
Avoid Matching Grout and Tile:
It's tempting to try matching color and tile colors.
You will find that it is nearly impossible to match tile and grout colors, so don't even try. Instead, aim for a hue lighter or darker.
Grout colorant is a waterborne epoxy that is applied to grout after it has become dirty and discolored. It is applied with small brushes that are the width of the tile seam. Typically it is difficult to lighten your tile grout. An easier fix is to choose a grout colorant that is a shade darker than your existing shade.
Shop Direct - Aqua Mix Grout Colorant