Need grout color for steam shower-marble with white subway
We are doing a marble mosaic accent panel in our new steam shower (basketweave, white marble with dark gray marble dots lining each piece of the basketweave) and a large format 5x13 matte subway tile on the rest of the shower, with gray slate (looking) floor. Currently the plan is to use white grout, but i've read on here that it won't stay white for long. would you suggest gray instead? also, i've heard adding epoxy to the grout is advantageous, but that it could add a yellow tinge to white grout. thanks!