Blue goop

U.S. Air Force Tech. Sgt. Laura Valentstein, a 176th Fighter Squadron F-110 jet engine mechanic, based out of Madison, Wisconsin, dips a cotton swab into blue dye at Misawa Air Base, Japan, Oct. 12, 2017. After an F-16 Fighting Falcon engine is certified as fully-functional at Misawa AB’s centralized repair facility, the engine’s primary sections are marked with blue dye during the final inspection. (U.S. Air Force photo by Airman 1st Class Sadie Colbert)

PHOTO BY: Airman 1st Class Sadie Colbert
VIRIN: 171012-F-MZ237-0058.JPG
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