BASIC YELLOW 40

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Chemical Name:
BASIC YELLOW 40
Surface(s) Used On:
Non-porous surfaces.
Sensitive To:
Cyanoacrylate deposit.
Development Color: Method to Record: Hazard: Protective Clothing: Fume Hood Use:

Yellow Fluorescence

Yellow filter

U.V.-Eye Protection

Yes
Reagent Characteristics

Development Complete When:

Source of Error:

Incompatibilities:

Precautions:

Storage Container:

Safety:

Recommendations:


Similar Reagents



Sequential Reagents



Abridged Reagent Sequence


Visual Examination
|
Forensic Light
|
Cyanoacrylate Fuming
|
** Basic Yellow 40 **
|
Forensic Light
|
R.A.Y.
|
Forensic Light

BASIC YELLOW 40 FORMULA:
I.  Working Solution

    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 415 nm to 485 nm range. 
View using yellow or orange colored goggles.

3. 
Photograph results using a 
yellow or orange colored or 515(BP 35) 
bandpass filter.


Ridge Detail Visualized by:

Forensic Light Source induced.
Ultra-violet Induced


Reagent Applicabilities:

Non-Porous surfaces
Post-Cyanoacrylate
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.
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.
Supporting Reference Materials:
1. Minutiae Magazine, Summer Special 1994, Issue No. 24, pg.7.
2. "Chemical Formulas and Processing Guide for Developing Latent Prints", U.S. Dept. of Justice, pg. 47-48, 1994.
3. Advances in Fingeprint Technology 2nd. Ed., Lee, H.C. & Gaensslen, R.E., CRC Press, Boca Raton, FL., 2001.
4. Manual of Fingerprint Development Techniques 2nd. Ed., Home Office - Police Scientific Development Branch, White Crescent Press, Ltd., Luton, England, 2001.
5. Technical Notes, Lightning Powder Co. Inc., Salem, OR., 2001.

Return to: Main Page   ||  Non-Porous Surfaces  ||  Ultra-violet induced  ||  Post-cyanoacrylate  ||  Tape Surfaces  ||  Plastic Bag Surfaces  ||  Glass Surfaces  ||  Cartridges  ]