Senior Airman Jonathan Hubbard, 22nd Maintenance Squadron Fabrication Flight, conducts a spark test on a piece of metal to determine its type, Sept. 14, 2009, at McConnell Air Force Base, Kan. To perform the test, he sanded the metal and evaluated the color of sparks it produced. Each metal gives off a unique color of spark. (U.S. Air Force photo/Tech. Sgt. Chyrece Campbell)
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