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Development Color:
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Method to Record:
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Hazard:
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Protective Clothing:
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Fume Hood Use:
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Formula
Procedure of Application
Development Complete When
Source of Error
Incompatibilities
Precautions
Storage Container
Safety
Recommendations
Similar Reagent
Sequential Reagent
Formula
Working Solution: Take 1 gram Basic Yellow 40 dye dissolved in 500 ml Methanol. Procedure of Application
1.
a) Tray immersion or
aerosol sprayer
for 5 seconds.
b) Water Rinse - Squirt bottle application or gently running stream for 10 seconds 2. View under an Ultra-Violet lamp around 365 nm. View using ultra-violet protection goggles. 2a. View under a Forensic Light Source in the 450 nm to 485 nm range. View using yellow colored goggles. 3. Photograph results using a yellow colored or 515(BP 35) bandpass filter. Development Complete When
The cyanoacrylate has absorbed the dye stain. Source of Error
Too much absorbed dye stain fluoresces too brillantly to be effective for photography. Incompatibilities
Items that inherently fluoresce in the 490 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. Storage Container
Dark stoppered glass bottles. Safety
Use Ultra-violet protection goggles when working with low-wavelength (i.e. 365 nm) light sources. Fume hood use is required. Recommendations
Misting the item with Basic Yellow 40 from an aerosol sprayer cuts down on excessive background staining. Similar Reagent
Sequential Reagent
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Chemical Name
Basic Yellow 40 Surface Used On Non-Porous Surfaces Sensitive To Cyanoacrylate deposit Abridged Reagent Sequence
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Ridge Detail Visualized by:
Ultra-Violet light induced Forensic Light Source induced Reagent Applicabilities: Post Cyanoacrylate Non-Porous surfaces Fluorescent technique Other Chemical Name(s): BY40 Panacryl Brilliant Flavine 10GFF Maxilon Flavine 10GFF Yellow Brilliance Working Solution Shelf-life: Six (6) months |
Process Summary:
A fluorescent dye-stain used to enhance cyanoacrylate-developed latent prints. A forensic light source or ultra-violet lamp that will output light between 365 nm and 500 nm is required for this process.
A fluorescent dye-stain used to enhance cyanoacrylate-developed latent prints. A forensic light source or ultra-violet lamp that will output light between 365 nm and 500 nm is required for this process.
Accepted Deviations:
The working solution may be applied by either dipping, spraying or squeegee bottle. Some researchers advise to allow the cyanoacrylate-developed prints to "sit" overnight prior to applying the dye stain.
The working solution may be applied by either dipping, spraying or squeegee bottle. Some researchers advise to allow the cyanoacrylate-developed prints to "sit" overnight prior to applying the dye stain.
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.
- Advances in Fingeprint Technology 2nd. Ed., Lee, H.C. & Gaensslen, R.E., CRC Press, Boca Raton, FL., 2001.
- Manual of Fingerprint Development Techniques 2nd. Ed., Home Office - Police Scientific Development Branch, White Crescent Press, Ltd., Luton, England, 2001.
- Technical Notes, Lightning Powder Co. Inc., Salem, OR., 2001.