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. 2022 Apr 6;17(4):e0265185. doi: 10.1371/journal.pone.0265185

Fig 4. Spectral reflection analysis of cyan, magenta, and yellow inks illuminated with 31 LED channels spanning visible to near-infrared illumination.

Fig 4

Images of each dye were captured by a monochromatic camera and grayscale reflectance intensity sequentially arrayed in the top inset.