Tension wood is considered to be an important defect by the wood processing industries. A considerable amount of research has been done to determine the presence and structure of tension wood, however, there is a need to find a quick, practical and applicable method to evaluate the severity of tension wood. | Research Article Turk J Agric For 34 (2010) 381-392 © TÜBİTAK doi: A staining method for determining severity of tension wood Ayşe Dilek DOĞU1,*, Michael GRABNER2 1 Department of Forest Biology & Wood Protection Technology, Faculty of Forestry, İstanbul University, 34473 Bahçeköy, İstanbul - TURKEY 2Department of Material Sciences and Process Engineering, Institute of Wood Science and Technology, University of Natural Resources and Applied Life Sciences, Peter Jordan Str. 82, A-1190 Vienna - AUSTRIA Received: Abstract: Tension wood is considered to be an important defect by the wood processing industries. A considerable amount of research has been done to determine the presence and structure of tension wood; however, there is a need to find a quick, practical, and applicable method to evaluate the severity of tension wood. This study investigated whether zinc-chlorine-iodide (Herzberg reagent) could be applied in determination of tension wood severity. Fagus sylvatica L. (beech wood), Populus alba L. (poplar wood), and Quercus robur L. and Quercus rubra L. (oak wood) species were used in this study. The results were compared with safranin/astra blue and acridine orange to verify the accuracy of the classification of the severity of tension wood. The results showed that the severity of tension wood was incorrect, and in particular the color reaction obtained with zinc-chlorine-iodide was weak; on the other hand, it was reliable for beech and poplar woods, where the color reaction was strong. Key words: Acridine orange, safranin/astra blue, staining methods, tension wood severity, zinc-chlorine-iodide Çekme odunu şiddetinin boyama metodu ile belirlenmesi Özet: Çekme odunu endüstriyel alanda önemli bir kusur olarak kabul edilmektedir. Günümüzde çekme odununun varlığını ve yapısal özelliklerini belirlemek amacı ile yapılmış çok sayıda araştırma bulunmaktadır. Ancak halen, çekme odunu şiddetini belirleyecek hızlı, pratik ve herkes
