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. 2021 Jun 18;21(12):4178. doi: 10.3390/s21124178

Figure 3.

Figure 3

(a) Photoacoustic spectra of saffron, 2% of tartrazine in saffron, 5% of tartrazine in saffron, 10% of tartrazine in saffron and 20% of tartrazine in saffron. The spectra have been normalized in the 10.90–11.00 μm range (right red box). Absorption in the 9.85–10.00 μm range (left red box) drops while the tartrazine mass ratio increases. (b) Photoacoustic spectra of saffron, 2% of turmeric in saffron, 5% of turmeric in saffron, 10% of turmeric in saffron and 20% of turmeric in saffron. The spectra have been normalized in the 8.85–8.95 μm range (left red box). Absorption in the 9.40–9.55 μm range (right red box) drops while the turmeric mass ratio increases.