Facing brick made entirely with red baking diluvial clay from the Meuse Valley. The clay is cast at one go, which accounts for the characteristic irregularities and ribs of the unfinished brick.
After firing, the whole brick features a varied multi-colour richness with a light beige tone enhanced with shades of red pastel, dark brown and delicate blue. There are even some dark brown/black bricks. Slight differences from one series to another are possible