Very pronounced and strong appearance. Differences of shades which depend on the growth of the plant and the type of wood are a particular feature. Cracks in aging, heart and resin allowed. The surface looks old wooden slat in all its thickness. Sound knots, repaired or grouted nodes are allowed. Gluing without defects. Retro: Spruce aged, compact surface, knobby and stuccoed knots, deep sapstain not allowed.