I received a few opinions on the grout choice for my kitchen back splash and it made me take a look at my choice again.  I do read your comments and take them to heart.  I had bought gray grout, but the more I thought about it, the more I was unsure about the gray.  Finally, I read a comment from a reader who suggested I test it out on a small section of tile.  Duh.     I put a small amount of tile on a piece of cardboard and applied the gray grout.  It wasn’t working for me at all.  It’s not that it looks bad, but it really brings out the gray in the tile and makes it look much darker. (Really, the two test patches look like entirely different tile, it’s that dramatic.)  I was also concerned with how this might highlight any mistakes. I have