| Author | Message | ||
     Andrew Reitnauer (Unregistered Guest) Unregistered guest Posted From: 140.241.0.20 |
First, what surface is it on? Secondly, my experience has always been that the best tool in the lab is the camera. If you can see the print with red light, try to replace your eye with the camera. | ||
| Wendy Garcia (Wendy) Member Username: Wendy Post Number: 1 Registered: 04-2007 |
Has anyone run into a problem where you can see the fingerprint on a non-porous surface, but you can not recover it? This is a case where I have used Rhodamine 6G, Fluorescent powder, UV lights, black and magnetic powders, however I can ony see it white light red light. My problem is, I know that the print it there, because I can see it with oblique lighting, but print will not adhere to any of the formulas. | ||
| Andrew Reitnauer (Unregistered Guest) Unregistered guest Posted From: 140.241.0.20 |
There is a description of a water based method on the Lightning powder website that states R6G can be mixed with either water or methanol to make the solution. Also, the RCMP website has a page describing applications, and I do not believe that petrolium-ether is needed: http://www.rcmp-grc.gc.ca/firs/recipes/rhodamine_e.htm Also, the Chesapeake Division of the IAI has a great reagent link on their website: http://www.cbdiai.org/Reagents/start.html Good luck with your research. | ||
| knirfl (knirfl) Member Username: knirfl Post Number: 1 Registered: 11-2006 |
dear all, within the scope of my bachelor term paper I'll have to improve rhodamine application focused on problem of washing away fingerprints. I've read that with a petroleum-ether based solution there's no need rinsing the surface with water after application. Does anyone has experience with this? any formulation available? Furthermore I'm looking for a water-based formulation but can't seem to find one. Can anyone help me out? Any other suggestions, hints and/or comments to attack this problem are greatly appreciated! thx in advance |
