Types of Indication in Liquid Penetration Testing

Indication:
marks a discontinuity. In LPT it is the presence of bleed out.

Nonrelevant Indications:
LPI indications resulting from conditions not associated with a material discontinuity.

Irrelevant Indication:
indication resulting from poor technique and not associated with a material discontinuity.

False indication: Indication created by improper cleaning of the test surface by any dirt, paint, oil, grease or any loose scale that could either keep penetrantout of a defect, or cause irrelevant or false indications.