Curious about how critical flaws are detected in materials without causing damage? In this episode of "Unlocking Secrets" on the Industrial Welding Inspection Podcast, host John Masseny takes you inside the world of Non-Destructive Testing (NDT) with a focus on two essential techniques: Dye Penetrant Inspection (DPI) and Magnetic Particle Inspection (MPI). Learn how these methods help identify surface and near-surface defects in industries ranging from aerospace to railways—keeping machinery, structures, and lives safe. Whether you're an industry professional or simply interested in how safety is ensured behind the scenes, this episode breaks down the science, application, and importance of DPI and MPI. Tune in and uncover how these powerful tools work to prevent failures before they happen.