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Chemical Name:
Surface Used On:
Light-colored adhesive tape surfaces.
Sensitive To:
Sebaecous/Eccrine components.
Development Color: Method to Record: Hazard: Protective Clothing: Fume Hood Use:

Dark gray


Reagent Characteristics

Development Complete When:

Source of Error:



Storage Container:



Similar Reagents

Sequential Reagents
(Not necessarily in this order.)

Abridged Reagent Sequence

Visual Examination
Forensic Light
Gentian violet
*** Liqui-Nox ***
Wet Powder - black
Forensic Light

(In a shallow bowl mix)
20 drops tap water
20 drops Liqui-Nox
.5 g black fingerprint powder

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.

Reagent Applicabilities:

Non-Porous surfaces
Tape surfaces

Other Chemical Name(s):

Alternate Black Powder

Working Solution Shelf-life:

Prepared as needed.

Process Summary:

Liqui-Nox is a laboratory glassware soap that is used to create a soap/powder foam that is painted unto adhesive tape surfaces.

Accepted Deviations:

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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