Travertine begins as a calcareous dispersion which is then deposited by hot mineral springs.

The result of this method of formation is a honey-combed structure which when finished has visible surface pitting and voids. Travertine generally comes in either ‘cross-cut’ or ‘vein-cut’ formats. Vein-cut tiles are cut so that the surface plane of the tile runs parallel to the long veins present, cross-cut tiles are cut perpendicular to these veins. 

Once tiles are cut they are then either filled with a colour matched resin, or left unfilled. Generally the voids are only left unfilled in Tumbled or Brushed finishes, where these voids are filled during the grouting process.

Although filling of the voids gives a smoother surface, through general usage, some small areas of fill may dislodge or previously unexposed holes may become visible. This is not unusual and the holes should be re-filled with a suitable resin or grout. Travertine tiles may require additional adhesive to be applied to the rear of the tile in order to fill any larger voids.