The excess oil on the surface of the part is removed by rinsing or dipping the part in chemicals designed to remove the excess oil. The part is then treated with a chemical developer. If surface defects exist, the fluorescent dye remaining in the defect can be seen under near-ultraviolet or black light. Highly trained and certified inspectors perform these tests. Field and flight line inspections are performed using portable inspection kits consisting of aerosol spray cans of dye, rinse and developer.
Solvents used in the process have volatile components and the process generates oily waste rags.
The government reserves the right to fund more than one proposal either to meet this requirement fully or to pursue more than one innovative approach .