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

Table 4

Chromaticity and color difference of the aging samples.

	Sample	Color coordinate						Chroma ()
			1#	30.935	0.577	0.371	62.452							52.263	50.530	72.71	0	—	—	—	—
	2#	16.951	0.535	0.374	48.198	38.825	36.977	53.62	14.32	14.254	13.438	13.553	14.32
	3#	11.300	0.503	0.374	40.081	28.550	25.495	38.28	24.37	8.117	10.275	11.482	10.05
	4#	8.241	0.474	0.367	34.479	18.997	16.983	23.59	31.44	5.602	9.533	8.512	7.07
	5#	6.454	0.451	0.363	30.530	13.478	12.879	18.64	35.62	3.949	5.499	4.104	4.18
	6#	5.920	0.439	0.361	29.209	12.961	12.133	17.75	36.67	1.321	0.517	0.746	1.05