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|Surface Used On:
Light-colored adhesive tape surfaces.
Development Complete When:
Source of Error:
(Not necessarily in this order.)
Abridged Reagent Sequence
*** Liqui-Nox ***
Wet Powder - black
(In a shallow bowl mix) 20 drops tap water 20 drops Liqui-Nox .5 g black fingerprint powderPROCEDURE OF APPLICATION
1. Mix the ingredients to create a foam with bubbles. 2. Use a camel hair brush to paint the tape surface with the mixture. 3. Wait 15 to 30 seconds. 4. Rinse tape under a gentle stream of tap water. Allow the tape to air dry. 5. Photograph any developed detail.
Ridge Detail Visualized by:
Visible chemical/stain reaction.
Other Chemical Name(s):
Alternate Black Powder
Working Solution Shelf-life:
Prepared as needed.
Liqui-Nox is a laboratory glassware soap that is used to create a soap/powder foam that is painted unto adhesive tape surfaces.
The reagent mixture can be prepared, then allowed to dry to produce a residue. This dried residue can be reconstituted by the addition of tap water until the desired consistency is obtained. Ash Gray fingerprint powder can be used in place of black fingerprint powder to develop ridge detail on black electrical tapes.
Supporting Reference Materials:|
1. K. M. Parisi, “Getting the Most of Your Fingerprint Powders”, Jor. Forensic Identification, vol. 49, no. 5, Sept./Oct. 2005, pp. 494-498.
2. Minutiae Magazine, Summer Special 1994, Issue No. 24, pg.7.
3. "Chemical Formulas and Processing Guide for Developing Latent Prints", U.S. Dept. of Justice, pg. 47-48, 1994.
4. Advances in Fingeprint Technology 2nd. Ed., Lee, H.C. & Gaensslen, R.E., CRC Press, Boca Raton, FL., 2001.
5. Manual of Fingerprint Development Techniques 2nd. Ed., Home Office - Police Scientific Development Branch, White Crescent Press, Ltd., Luton, England, 2001.
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