Which of the following is an advantage of fluorescent penetrants over visible-type penetrants?

Fluorescent penetrants have a distinct advantage in that small indications can be more easily detected compared to visible-type penetrants. This is primarily because fluorescent penetrants are designed to glow under ultraviolet (UV) light, enhancing visibility even in low light conditions. The fluorescence allows for greater contrast against the background, making tiny cracks or defects stand out much more clearly than they would under normal lighting conditions, which is especially beneficial in applications where the integrity of the material is crucial, such as in aerospace or critical structural components.

In contrast, while factors such as cost-effectiveness, ease of application, and drying time are important considerations in the selection of penetrants, they do not inherently offer the same level of sensitivity for detecting small defects as fluorescent penetrants do. Therefore, the ability to clearly identify small indications sets fluorescent penetrants apart in non-destructive testing applications.