Fig. 3From: Effects of natural weathering on aged wood from historic wooden building: diagnosis of the oxidative degradationThe damage level of aged wood samples from SEM microanalysis. a F-0, class I; b F-1, class II; c F-2, class III; d F-5, class III; e F-3, class IV; f F-4, class IV; g F-6, class IV; h F-7, class IV; and i F-8, class VBack to article page