Andrew Paul is Popular Science‘s staff writer covering tech news. Previously, he was a regular contributor to The A.V. Club and Input, and has had recent work featured by Rolling Stone, Fangoria, GQ, Slate, NBC, as well as McSweeney’s Internet Tendency. He lives outside Indianapolis.
Imagine a crime scene. Chances are, you’re also imagining someone dusting for fingerprints. Despite recent debates of whether fingerprint evidence is accurate and reliable, it can still prove extremely useful in certain situations, such as narrowing down potential suspect lists. Unfortunately, this technique often employs toxic powders, including environmentally harmful petrochemicals that can damage DNA evidence.
Short for “latent fingerprints,” LFP-Yellow and LFP-Red are applied using a simple spray bottle, which then selectively binds to negatively-charged molecules within fingerprints. Once stuck to the residual prints, the dyes begin to glow under blue light in just 10 seconds. Interestingly, the solution is only “weakly fluorescent” before applied to LFPs, according to University of Bath researcher, Luling Wu, in a recent profile.
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