White grout should be illegal!! I have struggled with it in both a kitchen and now in the master bath (I didn't pick the grout the second time. It was there when we moved in). Those are both applications where you will live to rue white grout and find it increasingly more aggravating with each passing day! It is so much work to keep it clean (and the longer you are there, the harder that difficult job becomes!), I am looking at having my master bath regrouted. The darker the grout, the more forgiving in terms of showing grime, mildew, etc. Those all white bathrooms look beautiful on the day of installation but the honeymoon doesn't last long!

Bill, I am reading many comments that epoxy grout will yellow over time because of UV rays. Would this only happen if direct sunlight hits it or after long term exposure to any up light, even if filtered. Would Mapei‘s Flexcolor which is an acrylic grout have the same issue?

Hi. What did you decide to do here? Looking for light grey from prism.

Went down to floor and decor to look at the examples. Wow you are right Skippack, rain is BLUE when it’s up on the wall. I’m really glad we didn’t pick it and did more research. Frost seems to be just dark enough to make the tiles show through without making the grout the focal point. It seems to be the right shade of grey too. Warm Grey was also on my list but it’s exactly that - too warm. I wanted something on the cooler side.