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Optical properties of latent pigments. (a) Absorbance and luminescence spectra of all used latent pigment precursors. (b) Photo of the latent pigments as observed under ambient light due to scattering and (c) under ultraviolet illumination due to their PL (QA = quinacridone, ED = epindolidione, IN = indigo, PC = phthalocyanine, IT = indanthrene).
