How do forensic scientists find fingerprints?

Melissa and Jam are joined by Nicki Stewart for the second part of their forensic-chemistry series. They discuss the material left behind in a fingerprint and compare physical and chemical approaches to revealing latent prints, including powder adhesion, iodine, ninhydrin and cyanoacrylate fuming. The episode explains why the choice of method depends on the surface and the chemical composition of the trace, and why preserving and interpreting real evidence is more complicated than television depictions suggest.