Black light
Senior Airman Brian Burkett, 2nd Maintenance Squadron Non-Destructive Inspection, looks for magnetic particles under an ultraviolet light on Barksdale Air Force Base, La., Feb. 26. A variety of parts come into NDI, from aircraft parts to standard vehicle components. The particles fill in any cracks, and make them easier to identify before parts are repaired. (U.S. Air Force photo/Airman 1st Class Andrew Moua)