| Author | Message | ||
     Lawrence Parasram (Cop1976) Member Username: Cop1976 Post Number: 1 Registered: 03-2012 |
I have developed a simple and NON DESTRUCTIVE method (no blackening of printed side) for developing fingerprints on thermal paper using 1,2 indanedione. I wrote an article which has been published in "Identification Canada" which if the forensic journal for the Canadian Identification Society. If you would like any information on the process, please send me a message with youe e-mail and I can send you a copy of my article. | ||
| Geoffrey Faulks (Schlarper) Member Username: Schlarper Post Number: 1 Registered: 12-2009 |
UV light does a reasonable job, and it is non destructive as well. (Message edited by schlarper on December 04, 2009) | ||
| Graham Ford (Unregistered Guest) Unregistered guest Posted From: ip72-213-181-161.ok.ok.cox.net |
RTX has given me excellent results with thermal paper. Its application is similar to iodine. | ||
| Samantha Kranitz (Sambeggs) Member Username: Sambeggs Post Number: 2 Registered: 09-2009 |
I have had positive results in case work with thermal nin as well as PD. In experiments I have found that heating with no chemicals applied develops prints with great contrast. I don't however know if this will inhibit any other process or if it only works on certain types of thermal paper. | ||
| Andrew Reitnauer (Areitnau) Member Username: Areitnau Post Number: 15 Registered: 06-2007 |
When I process with Indanedione, I do not add heat. Once the solution has beed applied, I store the item in an envelope for 72 hours, checking it every 24 hours and photographing along the way. | ||
| Ernie Hamm (Unregistered Guest) Unregistered guest Posted From: 74-94-190-141-busname-pinevalley.in.indiana.hfc.comcastbusiness.net |
The below information was emailed to the webservant on 11 Sep 09 for posting. You can go to www.clpex.com home page, "Online Info", click "Hamm's Fingerprint Index" and enter "Thermal" as search query and submit. This will list various articles dealing with thermal paper techniques. Articles listed at this source have not been updated, but the following articles have also been published: Finger Tips: The Development of a Muriatic Acid Vapor Chamber, Fred Strikwerda, Identification Canada, 29:4 (2006) Technique used in treatment of thermal paper evidence (French and English) Chemical Fuming: A Practical Method for Fingerprint Development on Thermal Paper, Ronglian Ma and Qun Wei, Journal of Forensic Identification, 56:3, (2006) Experimental tests using various chemicals compared to ninhydrin technique for thermal paper The Use of Cellophane Tape to Overcome the Background Discoloration of Thermal Paper, Sandra D. Siegel, Journal of Forensic Identification, 57:2, (2007) Different brands of cellophane tape used to remove post-ninhydrin background stains The Use of Oil Red O in Sequence with Other Methods of Fingerprint Development, Kimberly Guigui and Alexandre Beaudoin, Journal of Forensic Identification, 57:4, (2007) Technique for recovering latent prints from kraft-white-thermal paper evidence that has been wet that improves DFO process Enhancement of Ninhydrin or DFO Treated Latent Fingerprints on Thermal Paper, Luther Schwarz and Inga Klenka, Journal of Forensic Sciences, 52:3 (2007) A clearing solution for thermal paper to enhance through whitening developed latent prints | ||
| Ernie_hamm (Unregistered Guest) Unregistered guest Posted From: adsl-154-223-22.jax.bellsouth.net |
Glad I was able to provide infomation by direct contact as my rejected post at this site was not resolved. Hope the references were of value. | ||
| Eliot Springer (Unregistered Guest) Unregistered guest Posted From: proxy7-m.huji.ac.il |
DMAC can work well but is messy. Also, ninhydrin - the paper will turn black but if you continue dipping in the solution with the solvent, the black eventually disappears. | ||
| Charles Eakins (Ceakins) Member Username: Ceakins Post Number: 3 Registered: 09-2009 |
We have tried 1,2 Indanedione following the Chesapeake Bay's directions, except for the addition of heat. We left the thermal paper at room temperature instead. Did you add heat? | ||
| Andrew Reitnauer (Areitnau) Member Username: Areitnau Post Number: 14 Registered: 06-2007 |
Have you tried 1,2 Indanedione? That is the standard reagent we use for thermal paper. You could also try HCL acid fuming. There is a good listing of reagents on the Chesapeake bay division of the IAI's website. | ||
| Charles Eakins (Ceakins) Member Username: Ceakins Post Number: 2 Registered: 09-2009 |
We have tried various methods of processing thermal paper for latent prints, with little to no success. Are there any methods anyone knows of with a good success rate? We have tried various forms of ThermaNin and black magnetic powdering so far. |
