In this paper, Raman spectra were acquired through the glass wall of the bottle using a 785 nm laser as excitation source. Principal component analysis (PCA) of the spectra allowed determination of the cask type in which the whisky was aged. Partial least-squares regression facilitated the determination of the age, the alcohol content, the filtering process, and whether or not a whisky contains artificial colourants. 

Read the full abstract at: Single Malt Authentication

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