What should operators do after rinsing with water in liquid penetrant testing?

After rinsing with water in liquid penetrant testing, the appropriate action is to inspect the parts under blacklight. This step is crucial because it allows operators to see any indications such as cracks or other discontinuities that may have been highlighted by the penetrant. The blacklight causes the fluorescent penetrant to glow, making it easier to detect those critical flaws that could compromise the integrity of the part being tested.

This inspection phase directly follows rinsing because it ensures that all rinse water is removed and any excess penetrant is properly visible. The blacklight technique is essential for proper evaluation, as it enhances the contrast between the background and the fluorescent indications, aiding in clearer, more accurate interpretation of results. This step is an integral part of the liquid penetrant testing process, ensuring effective detection of potential issues that need addressing.