A drop of Black-T chemical drips into a glass measuring cup filled with water at Misawa Air Base, Japan, Jan. 30, 2017. Black-T is a multi-step process which employs a series of chemically bonding products through the pipes, providing protection against rust, corrosion and external damage. During a maintenance check, boiler technicians mix in one drop of the chemical mixture to the water circulating through the boilers. (U.S. Air Force photo by Airman 1st Class Sadie Colbert)