Vitamin C crystals
Polarised light micrograph of crystals of vitamin C (ascorbic acid). Vitamin C is present in citrus fruits, rose hips & green vegetables. A deficiency of the vitamin in the diet may cause scurvy, symptoms of which include anaemia, haemorrhaging into the skin & gums & bruising & bone pains. Magnification: X 63 at 35mm , X 126 at 6x7cm size., Photo by DAVID PARKER/SCIENCE PHOTO LIBRARY.
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