Callus remover crystals, light micrograph
Polarised light micrograph of callus remover crystals, a mixture of salicylic acid and lactic acid. Callus remover medications are used to remove calluses, areas of thickened skin that form as a response to repeated friction, pressure or other irritation. Magnification: x93 when printed 10 centimetres wide., by MAREK MIS/SCIENCE PHOTO LIBRARY
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