The problem with analysing fingerprints is that sweat interferes and low contrast images are formed. Israeli researchers at the Hebrew University in Jerusalem have re-engineered the process. Now the gold nanoparticles stick to the oily substances in the fingerprints, producing a crystal clear negative image.
http://www.jpost.com/Health/Article.aspx?id=290951
http://www.huji.ac.il/cgi-bin/dovrut/dovrut_search_eng.pl?mesge135289218705872560