The Effects of Natural Weathering on Color Stability of Impregnated and Varnished Wood Materials

Table 4

The color changes of Scots pine before and after natural weathering.

	n	Before natural weathering						After 3-month natural weathering								After 6-month natural weathering
		L		a		b		ΔL		Δa		Δb		ΔE		ΔL		Δa		Δb		ΔE
		Mean	SD	Mean	SD	Mean	SD	Mean	SD	Mean	SD	Mean	SD	Mean	SD	Mean	SD	Mean	SD	Mean	SD	Mean	SD
Control	10	70.52	9.31	6.52	0.83	27.81	4.23	−21.49	3.27	4.25	0.54	2.22	0.27	22.02	2.82	−30.07	4.27	−4.26	0.52	−13.2	1.69	33.15	4.91
PV	10	78.85	10.09	7.66	0.88	32.36	4.47	−13.71	1.89	5.84	0.85	5.92	0.64	16.03	1.52	−23.65	3.26	−1.7	0.18	−8.84	1.02	25.31	3.67
SV	10	75.44	11.01	7.41	0.86	32.56	3.78	−12.83	1.49	5.81	0.65	4.34	0.37	14.74	1.71	−21.01	2.43	−4.3	0.37	−6.85	0.79	22.51	2.97
CCA + PV	10	71.2	10.82	6.25	0.80	29.50	3.60	−12.12	1.31	4.12	0.57	5.21	0.48	13.82	1.81	−18.49	2.26	−1.19	0.11	−3.84	0.49	18.92	2.61
AD-KD5 + PV	10	73.94	9.09	8.35	1.30	41.24	5.48	−11.17	1.63	5.11	0.80	5.67	0.64	13.53	1.30	−17.46	2.32	−1.88	0.21	−5.26	0.82	18.33	2.86
TN-E + PV	10	45.02	5.18	4.31	0.59	12.49	1.51	−7.37	0.89	3.55	0.49	5.92	0.54	10.10	1.41	−8.24	1.03	−6.43	0.59	−5.95	0.94	12.03	1.66
CCA + SV	10	70.98	8.02	6.96	0.83	28.51	2.94	−10.39	1.17	5.28	0.63	7.95	0.66	14.11	1.68	−17.37	1.96	−5.64	0.47	−6.21	0.74	19.29	2.30
AD-KD5 + SV	10	72.82	9.54	8.61	1.18	42.06	5.93	−10.17	1.43	3.54	0.48	7.76	0.86	13.27	1.82	−15.88	2.24	−3.68	0.41	−6.34	0.87	17.53	2.40
TN-E + SV	10	47.71	5.92	3.26	0.38	15.86	1.97	−6.24	0.77	2.98	0.35	7.65	0.95	10.31	1.22	−11.34	1.41	−6.37	0.79	−5.85	0.69	14.26	1.68

Note. : the number of measured samples. Mean (): average value of measurements. SD: standard deviations.