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Historically, work on fluorescence is rooted in studies of “epipolic dispersion” by John Herschel (1792–1871), who described a blue glow emanating from a thin, superficial layer (“epipolic stratum” from Greek έπίπόλη , a surface) of a colorless quinine solution near the surface where the light enters, with such “epipolized light” been changed in some way, as it was incapable of being epipolized again, indicating that epipolic dispersion is different from scattering (Herschel, 1845a