Chipped tile on kitchen floor

Hello, It seems that this 15-year-old tile (which is not flat and has a rough surface) is not only tough to clean in the little areas, but the tile is also chipping so that it looks like there is something black on the floor. The tile is a myriad of light tans. Does anyone know where I can pick up something that I can either spray or paint on the black areas? Thanks in advance!
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