He may have a good point. A dark floor is going to show dust more that a lighter floor. Same principle.

I use a separate bathroom when I color my hair for fear of staining my light limestone tile with light grout even though I use a golden blond.

I think lighter grout is just more aesthetically appealing. I would rinse my hair elsewhere when coloring it.

Beautiful tile. I'd use a grout close to the color of the tile for a beautiful, uniform look. (I used white with white tile in our guest bath, and I love it.)

Color your hair in a more forgiving (not white) bathroom, in the sink or bathtub, or treat yourself and let someone else do it for you.

FIrst photo -dark grout. Second photo light grout.

Despite their improved performance, however, all cementitious grouts are porous and subject to staining. That's why manufacturers and installers recommend sealing grout after it has cured for a couple of days and is completely dry. Sealers come in two varieties: membrane-forming and penetrating. The first type is prone to peeling or getting cloudy when residual moisture from mastic or underlayments pushes to the surface of the tile. Penetrating sealers, which still breathe after soaking into tile and grout, are preferable.

my feeling is the more square footage of tile you have, the less contrast you need for 'the effect' of the outlined tile. there are a lot of colors of grout between dark and light. you can have a small amount of contrast and have it look great.

I did white subways in my tub surround and white plank tiles on the floor. All white grout. 3 kids, 3 dogs. Here's my lesson-learned: if your tile job is immaculate enough to handle contrasting grout without showing grout line inconsistencies, do it. It doesn't have to be dark grey, could be a light dove grey. The white grout in the floor was brown within a week. It's sealed, and I scrub it, but I wish I'd done grey. Same with the shower.

Thank you everyone for the candid advice. I may just split the difference and go with a silver/light grey because yes I think the contrast will be plenty for me.

I am now unsure if I am loving the look of the entire ceiling area in the shower being tiled also. I came home today and found he had remembered incorrectly our having a conversation about tile on the ceiling and spent all day putting tile where I never wanted it. He told me to sleep on it and decide but I always thought this made a bathroom look too much like a public shower. What do you all think of how it looks now...??

I like the tiled ceiling.

I myself would be inclined to go with a light grey grout. I like the ceiling tiled, I think if you were to go dark grout with all those tiles, it might feel like the walls were closing in on you. It's really a preference thing and how else you decorate your bathroom, Iike the dark grout in pic, looks good with black accessories.

Thanks, I did not think I'd like the tile all the way across but the more I see it and envision the room finished I think I will love it.