Differential Raman Spectroscopy Combined with Chemometrics for Lipstick Test

Fig. 1. Raman spectra and differential Raman spectra after processing of sample 24 under excitation light with central wavelengths of 784 nm and 785 nm

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Fig. 2. Differential Raman spectrum of sample 7

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Fig. 3. Raman spectra of samples from three different brands

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Fig. 4. Raman spectra of three samples from same brand and different series

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Fig. 5. Clustering dendrogram

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Fig. 6. Gravel map drawn by agglomeration schedule

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Fig. 7. Joint distribution diagram of samples

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Table 1. Results of system clustering

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Table 1. Results of system clustering

Category	Sample number	Category	Sample number
1	1, 3, 4, 5, 6, 7, 8, 9, 14, 24	6	26, 37
2	11, 33	7	18, 25
3	15, 45, 46, 47	8	19, 38, 40, 41, 48
4	28, 49, 50	9	17, 20, 22, 23, 29, 31, 34, 35, 36
5	39, 42, 43, 44	10	2, 10, 12, 13, 16, 21, 27, 30, 32

Table 2. Function summaries of the first three characteristic functions
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Table 2. Function summaries of the first three characteristic functions
Function Eigenvalue Variance /% Cumulative variance /% Canonical correlation coefficient Wilks’ lambda M
1 343.644 46.6 46.6 0.999 0.000 0.000
2 246.784 33.5 80.1 0.999 0.000 0.000
3 59.702 8.1 88.2 0.992 0.000 0.000

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Jin Zhang, Hong Jiang, Bin Duan, Feng Liu. Differential Raman Spectroscopy Combined with Chemometrics for Lipstick Test[J]. Laser & Optoelectronics Progress, 2021, 58(24): 2430002

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