|
Development Color:
Vertical Divider
|
Method to Record:
Vertical Divider
|
Hazard:
Vertical Divider
|
Protective Clothing:
Vertical Divider
|
Fume Hood Use:
|
|
Formula
Procedure of Application
Development Complete When
Source of Error
Incompatibilities
Precautions
Storage Container
Safety
Recommendations
Similar Reagent
Sequential Reagent
Formula
1. Rhodamine 6G Stock Solution: 1 g Rhodamine 6G dissolved in 1 liter Methanol 2. M.B.D. Stock Solution: 1 g M.B.D. dissolved in 1 liter Acetone 3. R.A.M. Working Solution: (Combine in the order listed) 3 ml Rhodamine Stock Solution 2 ml Ardrox P133D 7 ml M.B.D. stock Solution 20 ml Methanol 10 ml Isopropanol 8 ml Acetonitrile 950 ml Petroleum ether Procedure of Application
Development Complete When
The cyanoacrylate has absorbed the dye stain. Source of Error
Surfaces that absorb too much dye stain will fluoresce too brilliantly to be effective for photography. Incompatibilities
Items that inherently fluoresce in the 555 nm range will interfere with the dye stain fluorescence. Precautions
Avoid excess build-up of cyanoacrylate, since this may result in ridge detail depicting little contrast to the strongly fluorescent surface. 'Pooling' may result if the item is immersed into a solution of the dye-stain. Storage Container
Dark stoppered glass or plastic bottles. Safety
Fume hood use is required when preparing and applying the reagent. Recommendations
The recommended procedure of application is the wash bottle method. Allow the cyanoacrylate treated item to sit overnight prior to dye staining. A rinse using Petroleum ether may be necessary to avoid excessive staining by the dye. Similar Reagent
Sequential Reagent
Vertical Divider
|
Chemical Name
R.A.M. Surface Used On Non-Porous Surfaces Sensitive To Cyanoacrylate Deposit Abridged Reagent Sequence
Vertical Divider
|
Ridge Detail Visualized by:
Forensic Light Source induced Reagent Applicabilities: Non-Porous Surfaces Fluorescent Technique Post Cyanoacrylate Other Chemical Name(s): None Working Solution Shelf-life: One (1) month |
Process Summary:
A mixture of fluorescent dye-stains used to enhance cyanoacrylate-developed latent prints. A fluorescent light source that will output light between 415 nm and 530 nm is required for this process.
A mixture of fluorescent dye-stains used to enhance cyanoacrylate-developed latent prints. A fluorescent light source that will output light between 415 nm and 530 nm is required for this process.
Accepted Deviations:
The excitation wavelength may be varied to determine which produces the best fluorescence.
The excitation wavelength may be varied to determine which produces the best fluorescence.
Supporting Reference Materials:
- Minutiae Magazine, Summer Special 1994, Issue No. 24, pg.7.
- "Chemical Formulas and Processing Guide for Developing Latent Prints", U.S. Dept. of Justice, pg. 47-48, 1994.
- Lennard, C.J. & Margot, P.A., "Sequencing of Reagents for the Improved Visualization of Latent Fingerprints", Jor. Forensic Identification, Vol. 38, No. 5, pp. 197-210, Sept./Oct. 1988