What is a common issue for prints developed with Ninhydrin?

The correct choice, which identifies a common issue with prints developed using Ninhydrin, highlights the phenomenon of fading. This is particularly relevant because Ninhydrin reacts with amino acids found in fingerprint residues to produce a color change, typically a purple-blue hue. Over time, these developed prints can undergo fading due to environmental factors such as light exposure, humidity, or chemical reactions, diminishing the clarity and visibility of the print.

In the context of forensic science, understanding the stability of developed prints is crucial, as fading can hinder the ability to clearly analyze the prints or use them as evidence in investigations. Therefore, Ninhydrin-developed prints may require careful handling and proper storage to prevent or minimize fading for effective examination.