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   Dye Penetrant Testing is probably the most widely used NDT method. The test object or material is coated with a visible or fluorescent dye solution. The excess dye is removed from the surface, and then a developer is applied. The developer acts like a blotter and draws penetrant out of imperfections which are open to the surface. With visible dyes, the vivid color contrast between the penetrant and the developer makes the "bleed-out" easy to see. With fluorescent dyes, an ultraviolet lamp is used to make the "bleed-out" fluoresce brightly, thus allowing the imperfection to be readily visible.



  • Portable
  • Economical
  • Simple Interpretations
  • No Power Needed


  • Surface Preparation
  • Porous Surfaces can not be inspected
  • Defects must be open to the surface




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