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Schematic illustration of saliva aerosols measurement on face coverings. (A) An amylase reagent for quantifying the activities of α-amylase captured by a mask. (B) A forensic press paper was used to map the distribution of α-amylase on mask surfaces. As shown are the mechanistic representation of the amylase reagent (C) and forensic paper (D) test. α-Amylase digests the α-1,4-glucosidic linkage and releases the blue dyes from the starch microsphere, producing colorimetric signals.
