Ninhydrin using a Freon solvent eliminates which common issue during processing?

Ninhydrin is a chemical reagent used to visualize latent fingerprints, particularly on porous surfaces. When using ninhydrin in a Freon solvent, one of the primary advantages is its ability to prevent ink from running. This is vital because many surfaces may have inks that could become smudged or distorted during the application of chemical reagents. Freon, being a non-polar solvent, minimizes the interaction between the ink and the solvent, allowing for a clearer and more accurate detection of fingerprints without compromising the integrity of the ink or the print.

By using a Freon solvent, practitioners can achieve better results with ninhydrin, ensuring that the process does not adversely affect the latent prints or the information contained within the ink. This is crucial in forensic science, where the clarity and authenticity of evidence can significantly impact investigations and legal proceedings.