Which of the following reagents is effective in enhancing bloody fingerprints?

Amido Black is a well-known reagent specifically used for enhancing bloody fingerprints. It reacts with proteins in the blood, producing a dark stain that effectively highlights the ridges of the fingerprint. This makes it easier to visualize the latent prints against the background of the surface.

Coomassie Blue is another reagent that can be used to visualize proteins but is less commonly employed for enhancing bloody fingerprints. It is primarily utilized in protein electrophoresis applications, particularly in gel staining.

The correct choice acknowledges that both reagents can be utilized in the context of enhancing bloody fingerprints, with Amido Black being more effective for this specific application. The option asserting that neither is effective is incorrect, as Amido Black does enhance blood prints significantly.