Tartaric acid crystals, light micrograph
Tartaric acid crystals, polarised light micrograph. Tartaric acid is an organic acid that occurs naturally in many fruits, most notably in grapes, but also in bananas and citrus fruits. It is widely used as an additive in food and industry. Magnification: x186 when printed 10 centimetres wide., by MAREK MIS/SCIENCE PHOTO LIBRARY
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