Saltillo Tile Repairs

[Lisa Eckman]

Does anyone have experience repairing (not replacing) Saltillo tiles? This is the terra cotta tile usually made in Mexico and dried in the sun. Has color variations (depending on the sun/shade) and animal foot prints (chickens, etc. that walked through when tiles were wet).  There are scratches in the tiles (probably from moving heavy objects), and I'm wondering if/how they can be rapaired and protected from further damage.  Any help/suggestions appreciated.