Heritage Science

Table 9 The correlation coefficient between the endmember and the corresponding component separated from different abundances by using NMF

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

Group	Abundance difference (%)	Composition	Correlation coefficient of Azurite and corresponding component	Correlation coefficient of orpiment and corresponding component
1	10	10% Azurite, 90% Orpiment + 20% Azurite, 80% Orpiment	0.7781	0.9965
2	20	10% Azurite, 90% Orpiment + 30% Azurite, 70% Orpiment	0.9956	0.7885
3	30	10% Azurite, 90% Orpiment + 40% Azurite, 60% Orpiment	0.9973	0.9176
4	40	10% Azurite, 90% Orpiment + 50% Azurite, 50% Orpiment	0.9917	0.9274
5	50	10% Azurite, 90% Orpiment + 60% Azurite, 40% Orpiment	0.9986	0.9278
6	60	10% Azurite, 90% Orpiment + 70% Azurite, 30% Orpiment	0.9998	0.9290
7	70	10% Azurite, 90% Orpiment + 80% Azurite, 20% Orpiment	0.9988	0.9309
8	80	10% Azurite, 90% Orpiment + 90% Azurite, 10% Orpiment	0.9984	0.9330

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