ANDREW LAMBERT PHOTOGRAPHY / SCIENCE PHOTO LIBRARY ANDREW LAMBERT PHOTOGRAPHY / SCIENCE PHOTO LIBRARY
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.
Model release not required. Property release not required.