The significantly greatest color difference was obtained with samples impregnated with pigments from S. cuboideum (red) (ΔE = 11.26) ( Fig. 1A and C). These samples also displayed one of the higher internal color coverages (25.07%). Conversely, samples impregnated with pigments from C. aeruginosa (green) showed the lowest color difference (ΔE = 5.25), although their internal color coverage was not statistically different from that of samples treated with S. cuboideum (red). Color difference achieved by samples impregnated with pigments from S. ganodermophthorum (yellow) was slightly superior than that of samples treated with pigments from C. aeruginosa (green). However, the samples impregnated with yellow pigments achieved the significantly lowest internal color coverage (5.19%).