Solid wood boards are made from round wood cutted from the best growing areas.
In next steps wood is cutted for strips and then long drying operation is apply according to DIN 1052-1. Sorting operation is helping to separate for wood class according to color, knots ect. Nature color, differences in the tree rings are came from the growing areas and type cutting. Wood glued board have the same properties as natural wood but with reduced capabilities to expansion,bending, shrinking. Keep in mind that big humidity and temperatures differences could induce listed reaction, as a natural wood behavior.