Vintage, structrured, brushed, hazel - oiled 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: permitted up to 100mm healthy and dark knots – even grouped ones – are permitted in each stripe, up to a diameter of 50 – 60 mm. Fallen-out knots are permitted, up to 40 mm in diameter when corrected by filling. Sapwood: Permitted, max. 3-4 mm width and 20-30 cm of length. Cracks are permitted, filled with black special material. Minor fill in defects, smaller holes formed during post-filling surface treatment are allowed.
According to the EN 13489 standard, 3 % of different grade than indicated is acceptable.