Heritage Science

Table 4 The result of correlation coefficient (CC)

From: Quantitative analysis of mixed pigments for Chinese paintings using the improved method of ratio spectra derivative spectrophotometry based on mode

Standard endmember	Methods
	NMF		FastICA		CC of endmember
	Component 1	Component 2	Component 1	Component 2	CC of endmember
Group 1
Cyanine	0.566	0.995	0.929	0.241	0.831
Ocher	0.886	0.797	0.951	− 0.283	0.831
Group 2
Zinnober	0.997	0.839	− 0.334	0.935	0.791
Gamboge	0.753	0.970	0.306	0.905	0.791
Group 3
Azurite	− 0.091	0.993	0.990	− 0.122	0.321
Orpiment	0.901	0.357	0.085	0.838	0.321

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