In this work, the surface characteristics of Oriental beech (Fagus orientalis L.) wood impregnated with Korasit KS, a water-based and copper-containing impregnation substance, were examined after three months natural weathering. The material was penetrated into at 3% 6% concentration levels according to ASTM D 1413-07 (ASTM 2007) standard. According results obtained, L* values all samples decre...