Which step immediately follows the dwell time during the general penetrant testing procedure?

• A. Remove excess penetrant
• B. Apply developer
• C. Post-clean
• D. Inspect

Answer: (A)

After the dwell period, the next step is to remove the excess penetrant from the surface. Leaving excess penetrant on the surface can smear or obscure indications and may dilute the developer’s ability to reveal flaws clearly. Wiping away the surplus ensures that the developer will interact with penetrant only where it entered defects, producing sharp, visible indications during inspection. The developer is then applied to draw penetrant out of defects and create the contrast needed for detection. Post-clean is typically done after inspection to remove any residual penetrant, and inspection occurs after development.