Fig. 2From: Compositional Analysis of Ternary and Binary Chemical Mixtures by Surface-Enhanced Raman Scattering at Trace LevelsTypical SERS spectrum of 5 × 10−6 M a methyl orange, b methylene blue, and c crystal violet. d PCA score plot modeled by the SERS spectra of 5 × 10−6 M MO, MB, and CVBack to article page