Liqui-Drox

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Chemical Name:
LIQUI-DROX

Surface Used On:
Dark colored tapes, adhesive & non-adhesive sides.

Sensitive To:
Cyanoacrylate deposit.

Development Color:	Method to Record:	Hazard:	Protective Clothing:	Fume Hood Use:
Yellow fluorescent	Yellow or 2A filter	Eye Damage	U.V. - Eye Protection	Yes

Reagent Characteristics

Development Complete When:

Source of Error:

Incompatibilities:

Precautions:

Storage Container:

Safety:

Recommendations:

Similar Reagents

LIQUI-DROX FORMULA:

200 ml Ardrox P-133D
400 ml Liqui-Nox
400 ml distilled water

Combine and stir the chemicals 
thoroughly. A thick milky-yellow
solution should result.

PROCEDURE OF APPLICATION


1. Using a camel hair brush, 
apply the reagent onto both sides 
of the tape until a lather is 
produced.

2. Wait approximately 10 seconds. 

3. Rinse under a gentle stream
of cold tap water.

4. Allow the tape to air dry.

5. View under a Forensic Light 
Source or Ultra-Violet lamp able to 
produce a long-wave ultra-violet 
light output.
Use ultra-violet protection,
yellow or orange colored goggles.

6. Photograph results using 
an ultra-violet blocking 2A filter.

Ridge Detail Visualized by:

Ultra-violet light induced.

Reagent Applicabilities:

Non-Porous surfaces
Post-Cyanoacrylate
Tape technique

Other Chemical Name(s):

None

Working Solution Shelf-life:

Six (6) months.

Process Summary:
Effective for dark-colored adhesive tapes, the Liqui-Drox method is a post-cyanoacrylate process involving brushing the reagent unto tape, rinsing, then viewing the result under long-wave ultra-violet light. This reagent is composed of a mixute of a fluorescent agent, a detergent and water.

Accepted Deviations:

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. Hollars, M., Trozzi, T., and Barron, B., "Development of Latent Fingerprints on Dark Colored Sticky Surfaces Using Liqui-Drox", Jor. Forensic Identification, Vol. 50, No. 4, July/Aug 2000, pp. 357-362.

[ Return to: Main Page || Non-Porous Surfaces || Fluorescent Techniques || Ultra-violet Induced || Post-cyanoacrylate || Tape Surfaces ]