Facing brick made entirely with a red-baking diluvial clay from the Meuse valley. The clay is cast in one throw, which accounts for the characteristic irregularities and ribs of the finished brick. The firing process results in a rich array of colour tones, including a light beige tone enhanced with
shades of red, dark brown and delicate blue. There are even some dark brown/black bricks. Slight colour variations from one batch to another are possible.