Figure 6.
Sunlight-induced color change of coated and uncoated wood due to photoinduced degradation of lignin, simulated using a xenon lamp. (a) Total change in color coordinates of wood coated with GDE/CLP coatings of different ratios with a coat weight of 12.4 g(CLP)/m2 and commercial reference coatings, and uncoated wood due to exposure to simulated sunlight. (b) Photoinduced degradation of lignin creating chromophoric structures, (c) which absorb light of green and blue hues.4,63 (d) Photograph illustrating the color change of uncoated wood after 600 h of simulated sunlight.