“…In the SERS spectra acquired from hair colored with p‐blue, prior to the heat exposure, we observed vibrational bands centered at 436, 466, 533, 1021,1090, 1154, 1180, 1301, 1361,1394, 1450, 1503, and 1590 cm −1 (Figure 1A). As was demonstrated by Higgins and Kurouski [19], these vibrational bands could be used for confirmatory identification of this colorant on hair. We found that a short‐term (6–12 min) heat exposure caused substantial changes in the SERS spectra of colored hair.…”