What are the visual characteristics of a defect indication after developing?

A defect indication after developing in liquid penetrant testing should present a clean contrast against the background, typically appearing in a defined shape. This clarity is critical because it allows for accurate evaluation of the defect's size, shape, and location, which are essential for assessing the integrity of the material being inspected. The development process enhances the visibility of the penetrant that has seeped into the defect, ensuring that it stands out effectively against the surface of the part being inspected. This distinct appearance is what inspectors rely on to make informed decisions regarding the quality and safety of the component.

In contrast, other characteristics such as smudged or indistinct indications would suggest poor visibility, making it difficult to determine the nature of the defect. Indications that are bright in color but lack a defined shape fail to provide useful information about the defect itself, as shape is a crucial aspect of identifying the type of flaw present. Additionally, indications that are only visible under specific lighting conditions can be problematic, as they may not be reliably detected during routine inspections, potentially leading to missed defects that could compromise part integrity.