Character: Its color is defined by the natural growth of the tree – with darker and lighter stripes. Without any particularly striking, harsh textural and color variations. Knots: Healthy knots up to a diameter of 3 mm, and dark knots up to a diameter of 1 mm are permitted, except for those in groups. Red heartwood: Not permitted.
According to the EN 13489 standard, 3 % of a different grade than indicated is acceptable.