I need to repair a chip in a floor tile. A piece about the size of a penny chipped out when I dropped a screwdriver. The chip is whole except for a smaller chip in one edge of it. I purchased a kit of epoxy repair (white) and plan to use it to bond the larger chip into the cavity. And, then, use more to fill the small chip that will still be there once the larger chip is in place. Before doing this, I wish to change the white tint to a light grey to match the light grey in the tile surface. What can I use (what kind of tint) to change the color from a pure white? Your opinions and suggestions, please.