. UV (a) and visible (d) spectra of the beers. Diluted (1:25, v/v) and undiluted beers were test for UV and visible spectroscopies, respectively. The wavelength interval was 1 nm. The corresponding principal component analysis (PCA) score plots using the UV (b, 27 brands _ 5 cans _ 161 wavelengths) and visible (e, 27 brands _ 5 cans _ 321 wavelengths) spectra. Eleven manufacturers are identified by letters from A to K. The corresponding plots show the loadings to the first two PCs of UV (c) and visible (f)
spectra.