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What are the required properties of a penetrant developer?

  • The material must be absorptive, to perform blotting action
  • It must have a fine texture but not be too fine, as this may block imperfections
  • For colour contrast penetrants it must mask out background contours and colours
  • It must be easily and evenly applicable
  • It must form a light and even coat
  • There must be no fluorescing of the developer when used with fluorescent penetrant
  • The penetrant bleeding from a discontinuity must easily wet the material
  • When used with a colour contrast penetrant it must be of a highly contrasting colour. It seems agreed that the best colour is white
  • It must be readily removable after the test is completed
  • It must be non-toxic and non-irritant

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