What is the method called that used highly visible red dyes?

• A. visible or color contrast penetrant method developed by Magnaflux
• B. fluorescent penetrant method
• C. magnetic particle inspection
• D. radiographic testing

Answer: (A)

This question is about the penetrant inspection methods and which one uses a highly visible red dye. The visible or color-contrast penetrant method is the correct choice. In this approach, a colored penetrant liquid (commonly red) enters surface-breaking defects, excess penetrant is removed, and a developer is applied to draw the penetrant out to the surface. The resulting indication is visible under normal lighting as a red flaw indication, making defects easy to spot without special lighting. Magnaflux is known for developing this color-contrast version of liquid penetrant testing.

By contrast, the fluorescent penetrant method uses a fluorescent dye that requires ultraviolet light to see the indication; magnetic particle inspection uses magnetic fields and iron particles to reveal defects; radiographic testing uses X-rays to image internal features.