TY - JOUR TI - Effect of Different Ratio Peracetic Acid Bleaching on Colour Changing of Spruce Wood and Beech Wood AU - BOZDOÄžAN BALÇIK, Ã. AU - ÖZDEMİR, T. JO - Sigma Journal of Engineering and Natural Sciences PY - 2019 VL - 10 SP - 11 EP - 18 DO - ER -