For manufacturing our Umato heartwood oak surfaces, planks of wood are first selected from the heartwood area of the oak trunk. These heartwood planks depict typical characteristics, e.g. heartwood splits and splay knots. The assorted products are then stored before drying for several days in a special chamber where they pass through a smoking process. During this process, the wood is solid colored and as a result, it gains an even dark coloring. The character of old oak logs emerges.