STEPHEN A. SKIRIUS / SCIENCE PHOTO LIBRARY STEPHEN A. SKIRIUS / SCIENCE PHOTO LIBRARY
Polarised light micrograph of crystals of an unstable polymorph (allotrope) of the explosive TNT (trinitrotoluene). This unstable form of TNT caused unexpected premature explosions in shell factories during the World War II. Magnification: x40 at 35mm size.
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