murdurur wrote:omg yes i just read this in a wikipedia article about fingerprints and thought it was so cool
''For example, the fingerprints of
tobacco smokers contain traces of
cotinine, a
nicotine metabolite; they also contain traces of nicotine itself. Caution should be used, as its presence may be caused by mere contact of the finger with a tobacco product. By treating the fingerprint with gold
nanoparticles with attached
cotinine antibodies, and then subsequently with a fluorescent agent attached to cotinine antibodies, the fingerprint of a smoker becomes fluorescent; non-smokers' fingerprints stay dark.''
Isnt that why if u smoke ur fingers become stained