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(a) Lightness; (b) Green-Red (Reddening); (c) Blue-Yellow (Yellowing) and (d) overall color difference ΔE over the treatment time of artificial weathering for the uncoated beech wood samples (control) and those coated by LNPs from beech (B-LNPs), chestnut (Ch-LNPs), Iroko (IR-LNPs) and Iroko–Norway spruce (IRNS-LNPs) in the accelerated weathering tester.
