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. 2021 Dec 7;13(50):60454–60461. doi: 10.1021/acsami.1c19228

Figure 3.

Figure 3

(Left) Filter paper disks coated with sensory polymers after spraying an acid solution of sodium nitrite (0.1 g NaNO2, 25 mL water, 2.5 mL HCl (37%)) and an aqueous solution of NaOH (1 M). (Right) RGB color definition parameters for each disk.