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

Fluorescent penetrants exhibit several advantages, particularly when it comes to detecting minute defects in various materials. The primary benefit is that small indications are more easily seen. This is due to the fact that fluorescent penetrants glow brightly when exposed to ultraviolet (UV) light, making even the slightest cracks or defects stand out against a dark background. This enhanced visibility allows for better inspection quality, particularly in industries where structural integrity is critical, such as aerospace or nuclear.

The other options highlight benefits in cost, application ease, and drying time, but they do not capture the critical role of fluorescent penetrants in enhancing defect detection. Their ability to make small flaws visible under specific lighting conditions is what sets them apart from visible-type penetrants, which rely on color contrast that may not be as effective in highlighting small surface irregularities.