Character: It is characterized by the knots and the prominent textural and color variations resulted from the discolorations near the pith. Flame pattern is permitted. Knot: 5 – 6 healthy and dark knots – even grouped ones – are permitted in each stripe, up to a diameter of 40 – 50 mm. Fallen-out knots are permitted, up to 40 mm in diameter when corrected by filling. Sapwood: Not permitted
According to the EN 13489 standard, 3 % of a different grade than indicated is acceptable.