shell (Unregistered Guest)
Posted From: 188.8.131.52
|Posted on Tuesday, June 26, 2007 - 10:39 am: ||
i'll have a go at answering!
latent prints are made up of 98-99.5% water the rest is made up of fats, urea, chlorides,amino acid & water. Cyanoacrolate vapour polymerises on some latene fingerprints to produce a white deposit. this polymerisation is thought to be catalysed by water and possibly some other constituents of latent fingerprints. the effectivness of the process is very dependent on the processing conditions. the high humidity in the superglue cabinet is believed to result in chlorides present taking up water which then initiates polymerisation.this results in the growth of a microscopically fibrous matted deposit. hope this helps
Sara C (Unregistered Guest)
Posted From: proxya.tcd.ie
|Posted on Tuesday, January 09, 2007 - 09:26 am: ||
Hi, I'm currently trying to get information on the chemistry of fingerprinting and have a few questions.
Firstly, does anyne know the chemical composition of fingerprints as all I seem to be able to find are fairly vague chemical compositions etc.
Secondly, how does cyanacrolate work from a mechanism point of view, what does it react with? and how?
Finally the information is for a presentation on forensic chemistry and if anyone has any suggestions for content it would be a great help.