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POTASSIUM NITRATE CRYSTALS

Potassium nitrate (KNO3) crystals, as seen through a light microscope. These large crystals form by slow cooling of the crystallizing solution. Potassium nitrate is soluble in water and is a component of gunpowder. (KEYSTONE/SCIENCE PHOTO LIBRARY/ANDREW LAMBERT PHOTOGRAPHY/SCIENCE PHOTO LIBRARY)

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20031121

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KEYSTONE

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SCIENCE PHOTO LIBRARY SPL