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Photographs of 2.0% caffeine in 1-propanol (a–f) when a hot solution was placed on a glass slide (scale bar 0.85 mm) and (g–i) selected images of 2-0% caffeine in 1-propanol hot solution placed in a petri dish showing fiber formation in the presence of solvent (scale bar: 0.92 mm). Red arrows indicate the formatin of microcrystals.
