Featured Microscopist: Spike (M.I.) Walker

Vitamin C Crystallites

Vitamin C crystallites

Vitamin C crystallized from aqueous solution. The photomicrograph was captured with a planapochromatic 4x/0.16 NA objective utilizing a low-power achromatic condenser. Illumination was provided by a 12-volt, 100-watt lamp using a Zeiss Ultraphot III microscope equipped with an automatic 35 millimeter photohead. The parallel yellow lines mark the abrupt changes in the rate of crystal growth (producing very much finer crystals) caused by breathing on the preparation at 60 second intervals. Photographed with Fujichrome Velvia. (12.5x)

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