Homogeneous, by definition, means of the same kind or having uniform composition. As regards tiles, it means the tile as a whole piece was manufactured with just one material from top to bottom, and therefore it can be round-edged at the sides without showing a different material within the tile.
As compared to the ceramic tile, ceramics are made of red clay with surface coloring. When chamfered at a corner, it will show the red base
Continue reading: Homogeneous Tiles – One and the Same Material