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I'm a little confused by your question here. It sounds like you plan on doing something like painting the tile, is that it? If so, then were it me, I would just remove the tile itself (grout and all) and install new colored tile in its place. By the time you get out all the old grout (which you would want to do if you plan on painting it and don't want the grout and tile the same color) and
If I'm way off on what you have planned, can you give some more information?