I would use use black

We just did a floor like that and used TEC DeLorean Gray. Worked great.

what type of TEC grout? just the regular unsanded cement based? This is a sample piece and the actual grout after it dried on marble. Silverado, TEC, regular grout.

using too much water w/cement based grouts can lighten the color. if this guy used an enhancing sealer, the grout would darken and stay like that.

this looks a bit on the pink side of gray

both of these say Silverado

The DeLOrean is nice

I put all the grays and whites in one column. Mist looks good. or the DeLorean. do some samples and see what you like out of those 3.

Not sure this phone picture will come through. Not much of the floor showing, but this is DeLorean Gray. Just enough depth to show up.

Apparently can't get it to attach. Will try a different way.

delorean usually is a cooler gray, leaning more towards a lavender gray tone. it works very well w/carrara because it's a cool tone marble.

get a few spare tiles and have your tile guy grout them w/3 diff colors. i'm sure he has extra bags of all of those gray tones.

I have a feeling the Silverado grout that our home supply shop recommended might be the wrong color for our tile. Do you think DeLorean Gray grout would be the best way to go?

I would use DeLorean or Light Pewter, but you should look at the samples with your tile. We can't see your exact tile.

By the way the blue walls in that bathroom are awesome. What color and make is that paint?

Thank you. That is Sherwin Williams Regatta (SW6517). It was selected as it matches a fabric that the homeowner had that she intends to have made into a window treatment. She is pretty brave with color choices.

A gray tone.

We use TEC Power Grout which is a sanded product - but it is not the same as the standard sanded grout. Do not use a standard sanded grout and do not use an epoxy grout. TEC Power Grout may not be available in box stores (not sure) but would be available in many tile stores.