One of the great things about saltillo tile is its uniqueness. Each tile is hand-made and no two tiles are alike. There are many reasons for the color variations between tiles. The tiles are fired in a caves or kilns and as the oxygen is depleted, the fire seek other sources of fuel which it find in the iron oxide in the clay tiles. This process flashes the tile and leaves a light buff color on the tile. Other parts of the tile are shielded by other tiles, also contributing to the different coloring. Occasionally a color additive is added as well to produce a wider variety of tile.
The tiles can also be created in a variety of shapes and sizes. Please enjoy the pictures below which demonstrate the differences between tiles when used for flooring.