E-Mail IMAGE: Fingerprint patterns made in blood are clearly visible on aluminum foil (left) and painted wood (right) when developed with a fluorescent polymer. view more Credit: Adapted from 2021, DOI: 10.1021/acsami.1c00710 Careful criminals usually clean a scene, wiping away visible blood and fingerprints. However, prints made with trace amounts of blood, invisible to the naked eye, could remain. Dyes can detect these hidden prints, but the dyes don't work well on certain surfaces. Now, researchers reporting in ACS Applied Materials & Interfaces have developed a fluorescent p...