
The smaller indication is clearer with 14A All 9 subsurface indications are present with 14A
During an inspection there are many factors to consider when evaluating a magnetic particle, such as background, brightness, and color. To learn more, read our blog, How Brightness and Contrast Impact NDT Inspections.

Brightness contrast is the difference in brightness of two adjacent surfaces. In NDT inspections, it doesn’t matter if the indication is high or low brightness. It just matters that the background (or rest of the surface) is the opposite brightness.

Can you believe this spiral is the same green through the entire image? Color perceptions are subjective during fluorescent NDT inspections. How we perceive the color of an object is often determined by the colors and brightness of neighboring objects.

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