7C Black

A highly-sensitive non-fluorescent, colored magnetic particle powder for wet magnetic particle testing on finished and in-process parts

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7C Black

Wet Method Colored Nonfluorescent Magnetic Particles

7C Black is a highly-sensitive magnetic particle powder for nonfluorescent (visible) wet method magnetic particle testing. Particle suspensions prepared with 7C Black provide clear, strong indications and are ideal for locating fine and medium discontinuities on finished parts.

7C Black can be mixed with water or oil and used to find inclusions, seams, shrink cracks, tears, laps, flakes, welding defects, grinding cracks, quenching cracks, fatigue cracks and other defects.

Use with WCP-2 white contrast paint to improve to improve probability of detection and sensitivity.


  • Clear indications under visible light
  • Heavy particle buildup for quick detection
  • Can be suspended in water or petroleum distillate (oil) vehicle
  • Great particle mobility
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