CLPEX Chat Board

does anybody konw Robert Olsen Jr. 's two nin-dry techniques—one describing the use of applying ninhydrin crystals directly on the evidence and then placing the item in a humidity chamber?

I worked with Bob, but did not hear of that method. You might look at the following in that same vein (dry ninhydrin):

Advanced Solvent-Free Application of Ninhydrin for Detection of Latent Fingerprints on Thermal Paper and Other Surfaces, Lothar Schwarz and Inga Frerichs, Journal of Forensic Sciences, 47:6 (2002) Comment: Use of ninhydrin crystals in a heated vacuum situation to reduce background

Ernie Hamm wrote:I worked with Bob, but did not hear of that method. You might look at the following in that same vein (dry ninhydrin):

Advanced Solvent-Free Application of Ninhydrin for Detection of Latent Fingerprints on Thermal Paper and Other Surfaces, Lothar Schwarz and Inga Frerichs, Journal of Forensic Sciences, 47:6 (2002) Comment: Use of ninhydrin crystals in a heated vacuum situation to reduce background

thx Ernie,could you please send me this paper cause I'm in China,I can't find this magzine.....

Here is an article in SCAFO that has one method - placing the thermal paper between 2 paper towels that have been soaked in ninhydrin and dried. They are placed in a plastic bag for a couple of days for latent development.

http://www.scafo.org/library/140203.html

jpadilla5 wrote:Here is an article in SCAFO that has one method - placing the thermal paper between 2 paper towels that have been soaked in ninhydrin and dried. They are placed in a plastic bag for a couple of days for latent development.

http://www.scafo.org/library/140203.html

I've read it already ,thank u

u can also try out this work by Dr. O.P.Jasuja
Deciphering Latent fingerprints: Sandwich method revisited
http://forensic-evidence.com/site/ID/sa ... ethod.html

With kind regards
gds