Construction of Spectral Discoloration Model for Red Lead Pigment by Aging Test and Simulating Degradation Experiment

Table 6

Chromaticity features of the simulating degradation samples.

	Sample	Color coordinate						Chroma ()
			S1	30.935	0.577	0.371	62.452							52.263	50.530	72.71	0	—	—	—	—
	S2	16.521	0.458	0.366	47.651	26.696	25.834	37.14	17.35	14.801	25.567	24.696	17.35
	S3	13.228	0.426	0.361	43.104	19.287	18.466	26.69	23.68	4.547	7.409	7.368	6.33
	S4	10.788	0.399	0.354	39.227	14.140	12.822	19.08	29.05	3.877	5.147	5.644	5.37
	S5	10.139	0.385	0.351	38.094	11.601	10.349	15.54	31.00	1.133	2.539	2.473	1.95
	S6	8.425	0.377	0.349	34.858	9.590	8.676	12.92	34.22	3.236	2.011	1.673	3.22
	S7	7.402	0.361	0.345	32.712	6.923	6.237	9.31	36.78	2.146	2.667	2.439	2.56
	S8	6.625	0.350	0.343	30.944	4.977	4.770	6.89	38.66	1.768	1.946	1.467	1.88
	S9	6.272	0.336	0.338	30.099	3.108	2.701	4.12	40.14	0.845	1.869	2.069	1.48
	S10	5.650	0.327	0.336	28.512	1.782	1.633	2.42	41.65	1.587	1.326	1.068	1.51
	S11	5.225	0.316	0.332	27.375	0.276	0.345	0.44	43.03	1.137	1.506	1.288	1.38