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U.S. Air Force Senior Airman Robert Kost and Airman 1st Class Reuben Yancey, 23d Civil Engineer Squadron water and fuel maintainers, use a phenol red indicator in a water sample during an operational readiness exercise at Moody Air Force Base, Ga., Feb. 27, 2013. Phenol red is used to test the pH levels in the water. (U.S. Air Force photo by Airman 1st Class Olivia Bumpers/Released)


Red droplets

U.S. Air Force Senior Airman Robert Kost and Airman 1st Class Reuben Yancey, 23d Civil Engineer Squadron water and fuel maintainers, use a phenol red indicator in a water sample during an operational readiness exercise at Moody Air Force Base, Ga., Feb. 27, 2013. Phenol red is used to test the pH levels in the water. (U.S. Air Force photo by Airman 1st Class Olivia Bumpers/Released)

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