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

Table 3

The color changes of Oriental beech 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	62.30	7.60	10.78	1.38	21.78	3.01	−9.84	1.40	−9.83	1.26	9.94	1.31	17.10	2.60	−19.35	2.55	−12.3	1.87	−8.63	1.05	24.50	3.14
PV	10	68.07	7.35	12.60	1.20	27.04	4.19	8.92	1.23	−5.37	0.62	9.36	1.20	14.00	1.93	−14.78	1.89	−9.66	1.33	−10.07	1.09	20.33	2.34
SV	10	63.54	5.46	12.74	1.48	28.11	3.71	7.87	0.83	−5.65	0.66	8.45	1.23	12.86	1.49	−13.18	1.92	−10.16	1.18	−9.75	0.84	19.29	2.24
CCA + PV	10	60.53	5.57	12.15	1.56	28.51	3.93	7.78	0.95	−3.53	0.45	8.25	1.25	11.88	1.45	−13.63	2.07	−7.85	0.96	−7.53	0.69	17.44	2.41
AD-KD5 + PV	10	54.27	6.13	14.77	1.42	28.73	4.48	7.60	1.01	−3.39	0.53	7.26	0.89	11.04	1.47	−11.35	1.40	−9.41	1.25	−5.18	0.59	15.63	2.44
TN-E + PV	10	38.69	3.52	3.14	0.43	10.06	1.39	5.86	0.71	−3.97	0.55	6.95	0.77	9.92	1.20	−5.87	0.65	−6.81	0.82	−6.95	0.63	11.36	1.57
CCA + SV	10	61.46	5.10	11.90	1.42	28.96	4.89	6.92	0.78	−5.48	0.65	5.84	0.66	10.58	1.20	−13.02	1.47	−8.86	0.91	8.73	0.72	18.01	2.14
AD-KD5 + SV	10	58.21	6.46	12.43	1.70	27.50	3.77	6.83	0.96	−5.38	0.74	5.89	0.77	10.50	1.48	−10.56	1.38	−9.13	1.29	−7.81	0.87	16.00	2.19
TN-E + SV	10	35.51	4.40	2.83	0.33	8.87	1.22	6.55	0.81	−4.83	0.57	5.86	0.73	10.03	1.24	−6.85	0.85	−7.19	0.89	−7.24	0.90	12.29	1.45

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