What is the term for the action of a developer soaking up the penetrant from a discontinuity?

The term for the action of a developer soaking up the penetrant from a discontinuity is referred to as "blotting." In non-destructive testing methods, particularly in penetrant testing, the process involves applying a penetrant to a surface to detect cracks or defects. After allowing the penetrant to seep into the discontinuities, a developer is applied, which acts like a blotting paper, drawing out the penetrant from the defects.

This process is crucial because it enhances the visibility of the indications of defects, making it easier to identify issues in the material being inspected. As a result, blotting plays a key role in effectively revealing the presence of flaws by ensuring that the penetrant makes its way to the surface, where it can be read and evaluated. Other terms like absorption, migration, and evaporation do not accurately describe the specific action of the developer in this context.