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We report on persistent spectral hole-burning studies of thiazine and oxazine dyes encapsulated in an AlPO 4 -5 aluminophosphate molecular sieve. A non-photochemical hole-burning mechanism is provided by small additional solvent molecules, e.g. glassy ethanol or amorphous water, in the pore system. Hole-burning efficiency and spontaneous hole-filling are in the typical range of glassy bulk...