In a dye penetrant inspection, the developer's primary role is to

In a dye penetrant inspection, the developer's primary role is to

• A. Seep into a surface crack to indicate the presence of a defect
• B. Act as a blotter to produce visible indication
• C. Thoroughly cleans the surface prior to inspection
• D. Adhere to the surface to protect it

Answer: (B)

In dye penetrant inspection, the developer’s main job is to act as a blotter that draws penetrant out of any surface-breaking flaws and provides a contrasting background so the indication becomes visible. After the penetrant has seeped into cracks, the excess is removed, and the developer is applied. It soaks into the surface around the flaw and draws the penetrant toward the surface, producing a clear, visible indication against the lighter background. This contrast makes even small defects stand out for inspection. It isn’t responsible for seeping into defects—that’s the penetrant’s role—nor for cleaning or protecting the surface.

In dye penetrant inspection, the developer’s main job is to act as a blotter that draws penetrant out of any surface-breaking flaws and provides a contrasting background so the indication becomes visible. After the penetrant has seeped into cracks, the excess is removed, and the developer is applied. It soaks into the surface around the flaw and draws the penetrant toward the surface, producing a clear, visible indication against the lighter background. This contrast makes even small defects stand out for inspection. It isn’t responsible for seeping into defects—that’s the penetrant’s role—nor for cleaning or protecting the surface.