MARTYN F. CHILLMAID / SCIENCE PHOTO LIBRARY MARTYN F. CHILLMAID / SCIENCE PHOTO LIBRARY
Magnesium sulfate heptahydrate crystals, also known as Epsom salts, is an inorganic salt containing magnesium, sulfur and oxygen, with the formula MgSO4. The crystals are a drying agent and it is used in medicine, agriculture and leather processing.
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