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POTASSIUM NITRATE CRYSTALS

Potassium nitrate (KNO3) crystals. Large crystals (right) are prepared by slow cooling, and smaller crystals (left) by faster cooling of the solution from which they crystallize. Potassium nitrate is soluble in water and is a component of gunpowder. (KEYSTONE/SCIENCE PHOTO LIBRARY/ANDREW LAMBERT PHOTOGRAPHY)

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20031121

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KEYSTONE

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SCIENCE PHOTO LIBRARY SPL