CHARLES D. WINTERS / SCIENCE PHOTO LIBRARY CHARLES D. WINTERS / SCIENCE PHOTO LIBRARY
Ammonium dichromate ''volcano'': when the ammonium dichromate is ignited, a chemical reaction occurs, which turns the orange salt turns grey-green, the temperature increases, and flames and sparks shoot out of the solid. Shot 4 of 5 in a sequence.
Model release not required. Property release not required.