In magnetic particle inspections, which colors are typically used to indicate defects?

In magnetic particle inspections, the common colors used to indicate defects include red, black, and grey. Red is often used for the magnetic particles themselves, making it easy to identify and visualize the defects on the inspected surface. The black and grey colors can be associated with the background or the contrast agent, enhancing the visibility of the defects detected by the magnetic particles. The use of these colors is standardized in order to provide clear and unequivocal indicators of potential flaws, ensuring that inspectors can easily discern problematic areas.

The other color combinations listed, while they may be used for various purposes in other inspection techniques or parts of different processes, are not standard for magnetic particle inspections.