A.Michael Byrne, director of the Ceramic Tile Education Foundation, responds: The problem with discolored grout in kitchens is all too common, but it doesn’t have to be that way. There are three main issues: Choosing the right grout and grout color, installing it correctly, and sealing it with the right product. Tile choice can also make a difference.

Before choosing a grout color, you need to know how heavily the kitchen will be used. In a kitchen that sees only light cooking and cleanup, you should be able to use any color. Use pink if it makes the client happy. But if a lot of cooking is going to go on, you should probably choose a grout the color of dirty dishwater — gray — because that’s...

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