CHESAPEAKE BAY DIVISION - IAI
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Liqui-Drox

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Development Color:
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Method to Record:
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Hazard:
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Protective Clothing: 
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 Fume Hood Use:
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Formula
Procedure of Application
Development Complete When
Source of Error
Incompatibilities
Precautions
Storage Container
Safety
Recommendations
Similar Reagent
Sequential Reagent
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.


​
Development Complete When
The cyanoacrylate has absorbed the dye stain.













​
Source of Error
The tape must first be processed with cyanoacrylate fumes prior to applying this reagent.

A clear-colored reagent solution which has been standing for some time should be stirred to restore its thick milky-yellow color prior to use.








​
Incompatibilities
Items that inherently fluoresce in the long-wave Ultra-violet range will interfere with the dye stain fluorescence.












​
Precautions
Stir the working solution thoroughly to restore its thick milky-yellow color prior to use.












​
Storage Container
Dark stoppered glass or plastic bottles.













​
Safety
Use Ultra-violet protection goggles when working with long-wave ultra-violet light sources.

Prepare the working solution in a Fume hood.










​
Recommendations
Photograph the developed ridge detail immediately. Exposure to ultra-violet light for a lengthy time will cause the developed impression to fade.











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Similar Reagent
  • Gentian Violet
  • Liqui-Drox
  • Liqui-Nox
  • Sticky-Side Powder









​
Sequential Reagent
​Not Necessarily in this Order:
  • M.R.M. 10
  • R.A.M.
  • R.A.Y.









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Chemical Name
Liqui-Drox
​Surface Used On
Dark colored tapes, adhesive & non-adhesive sides
​
Sensitive To
Cyanoacrylate deposit
​
Abridged Reagent Sequence
  1. Visual Examination
  2. Forensic Light
  3. Cyanoacrylate Fuming
  4. Liqui-drox
  5. Ultra-Violet Lamp
  6. R.A.M.
  7. Forensic Light
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Ridge Detail Visualized by:
Ultra-Violet light induced


Reagent Applicabilities:
Post Cyanoacrylate
Non-Porous surfaces
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:
None

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. 

Address
Chesapeake Bay Division - International Association for Identification   

P.O. Box 71804, 
Henrico, VA 23255
Email
cbdiaisec@gmail.com
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  • Home
  • About Us
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  • Students
  • Resources
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  • ACE-V Methodology