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The color change of WPNFs-PU-ACN/Gly edible film and the corresponding grayscale range at 25 °C for different storage times (0, 1, 3, 5, and 7 days): (a) actual color change of WPNFs-PU-ACN/Gly edible film, (b) color change of WPNFs-PU-ACN/Gly edible film after grayscale, (c) grayscale range corresponding to the color change of WPNFs-PU-ACN/Gly edible film.
