Fluorescence imaging of target food products over time. On Day 1, the target food products were aliquoted into 10 g portions, which were stored within sealed bags at 4 °C. Three samples were selected at random each day and deposited as 10 mm slices onto glass slides as previously described. Samples were imaged under the same parameters as the baseline studies -at excitation and emission wavelength pairings of 350 nm/470 nm, 490 nm/525 nm, 557 nm/576 nm, and 649 nm/666 nm using a Nikon Ti-2 inverted microscope set to an exposure time of 300 ms. Mean intensity was calculated for each collected image, and a minimum of ten images were taken for each sample. This process was repeated several times using food products from different grocers to ensure reproducibility in the reported trends.