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G o o d   M o r n i n g !
Monday, June 13, 2005

The purpose of the Detail is to help keep you informed of the current state of affairs in the latent print community, to provide an avenue to circulate original fingerprint-related articles, and to announce important events as they happen in our field.

Breaking NEWz you can UzE...
compiled by Jon Stimac

Man Ordered to Trial in 1979 Slaying FLINT JOURNAL, MI - June 11, 2005 ...prints found at the scene were recently entered into the AFIS...

Cash, Charge or Fingerprint? NEWSDAY, NY - June 10, 2005 ...a 'little gadget' scans the index finger and instantly deducts the money from your checking account...

Fingerprinting of Job Seekers More Commonplace   PITTSBURGH POST GAZETTE, - June 7, 2005 ...mass printing is raising concerns among privacy advocates who question the accuracy of fingerprint data...

Tattoo May Be A Clue   PAWTUCKET TIMES, RI  - June 7, 2005 lead police to their fingerprint files which, they hope, will provide the name of the dead man...

Last week, we looked at the concept of High Dynamic Range imaging.

This week We keep abreast of latent print related information on the internet by looking at an interesting public website article.  This material was not altered in any way from the public posting at the link below as of yesterday, June 11.
Faking Fingerprints 
by "starbug"

How to fake fingerprints?

October 26, 2004 (starbug)

In order to fake a fingerprint, one needs an original first. Latent fingerprints are nothing but fat and sweat on touched items. Thus to retrieve someone elses fingerprint (in this case the fingerprint you want to forge) one should rely on well tested forensic research methods. Which is what's to be explained here. (Figure 1).

Figure 1: Fat residue from fingerprint

A good source of originals for our counterfeits are glasses, doorknobs and glossy paper. The standard method of forensic research makes them visible: Sprinkling it with colored powder, which sticks to the fat (Figure 2).

Figure 2: Visualisation with graphite powder

Another solution involves Cyanoacrylat, the main ingredient of superglue. A small amount thereof is poured into a bottlecap, which is then turned upside down and put over the fingerprint. (Figure 3).

Figure 3: Visualisation with superglue

The Cyanoacrylat gasses out and reacts with the fat residue to a solid, white substance (Figure 4).

Figure 4: Print after Cyanacrylate processing

The further treatment involves scanning/photographing (Figure 5) and a bit of graphical refurbishment (Figure 6).

Figure 5: Digitalising the print

Figure 6: Brushing up the image of the print

The goal is to get an exact image of the fingerprint, for further use as mold, out of which the dummy is made. The easiest way is to print the image on a transparency slide (the ones normally used for an overhead projector) with a laser printer. The toner forms a relief, which is later used similar to letter press printing. Wood glue is suitable for producing the dummy (Figure 7)

Figure 7: Wood glue for the dummy

A small dash of glycerene may be used to optimize humidity and workability. After thorough mixing, the dummy gets coated with a thin layer of the compound (Figure 8,9).

Figure 8: Covering the dummy with wood glue

Figure 9: Glue layer on the printout

After the glue has dried (Figure 10), it is pulled off the foil (Figure 11) and is cut to finger size.

Figure 10: Hardened glue

Figure 11: Dummy, ready to use

Theatrical glue is used to glue the dummy onto the own finger (Figure 12).

Figure 12: The new identity is ready!

The new identity is ready!
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Until next Monday morning, don't work too hard or too little.

Have a GREAT week!