Liquid Penetrant Testing
The objective of liquid penetrant testing is to provide visual evidence of surface discontinuities in solid non-porous materials. Liquid Penetrant Testing involves coating the test object with dye Penetrant. After allowing the dye penetrant to dwell for a pre-determined time, the excess dye is removed and a developer is applied. The developer aids in the visibility of the dye penetrant , thus revealing the discontinuity.