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. 2021 Sep 9;16(9):e0252806. doi: 10.1371/journal.pone.0252806

Fig 15. Comb foundation samples adulterated with stearic acid (N = 3) versus genuine beeswax (reference standard) with an emphasis on spectral regions indicative for adulteration detection.

Fig 15

Wavenumber, the number of waves per unit distance; cm, centimetre; a.u. is for the absorbance unit.