Fig. 5From: Study of amur cork tree bark extract-dyed paper under artificial UVA irradiationSEM photographs for the surface of P, P-A0, P-A1, P-A2 and A5 with ageing time. (P-0, P-A0-0, P-A1-0, P-A2-0, P-A5-0: 0day; P-30, P-A0-30, P-A1-30, P-A2-30, P-A5-30: 30days)Back to article page