We next investigated whether the photochemical reactivity of THC is preserved when adsorbed onto a physical matrix. Figure shows spectra recorded from 0.5 mg THC deposited onto a 2.5 μm Whatman filter, as used in the EDD. This quantity represents the low-end of what might be expected from a single actuation of real-world THC e-cigarettes, where concentrations of 500mg/mL and above are typical. From Figure , the structure and center of mass of the THC emission spectrum in EtOH is broadly preserved. Irradiation of the sample similarly gives rise to spectral features consistent with solution measurement, suggesting the same photochemical process is active and traceable when deposited on a solid matrix.