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

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 450 nm to 485 nm range. 
View using yellow colored goggles.

3. 
Photograph results using a 
yellow 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.

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