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acrylic prints caffeine crystals acrylic prints twinning acrylic prints crystals acrylic prints chemistry acrylic prints chemical acrylic prints crystal acrylic prints compound acrylic prints compounds acrylic prints false-coloured acrylic prints

photographs caffeine crystals photos twinning photos crystals photos chemistry photos chemical photos crystal photos compound photos compounds photos false-coloured photos

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False-colour scanning electron micrograph of anhydrous caffeine crystals (1,3,7- trimethylxanthine). They were produced by sublimation, that is, by heating the solid until it is vapourised, then condensing the vapour. This drives water out of the structure resulting in anhydrous crystals. Examples of twinning can be seen here, where crystals at different orientations interpenetrate producing cross shapes. Caffeine stimulates the central nervous system. It is often contained in analgesic preparations with aspirin or codeine, and it is a diuretic. It occurs in coffee beans, tea leaves & cola nuts. Magnification x240 at 6x4.5cm size.

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