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WET POWDER /
WET WOP (black)
|Surface Used On:
Light-colored tape surfaces.
Sebaceous & lipid components.
Development Complete When:
Source of Error:
(Not necessarily in this order.)
Abridged Reagent Sequence
*** Wet Powder/Wet Wop (black) ***
WET POWDER / WET WOP (black) FORMULA:|
Not Applicable – this reagent is pre-mixed and ready-to-use.PROCEDURE OF APPLICATION
1. Shake container before use. 2. Apply liquid using a camel hair brush to the adhesive side of tape. 3. Let the liquid set on the tape for approximately 10-15 seconds. 4. Rinse the tape under running cold tap water until friction ridge detail appears. 5. Allow tape to air dry. 6. Photograph any developed friction ridge detail.
Ridge Detail Visualized by:
Visible paste/stain reaction.
Adhesive tape surfaces
Other Chemical Name(s):
Working Solution Shelf-life:
Prepared and applied as needed.
This reagent is a pre-mixed, ready-to-use thick powder suspended in a liquid solution. It stains latent prints on the adhesive sides of light-colored tapes. The liquid is brushed onto the tape surface and a water rinse reveals any friction ridge detail. It is free from toxic chemicals and has an indefinite shelf life.
An alternative application method is to immerse tapes into a bowl containing the reagent.
Supporting Reference Materials:|
1. D.C. Wade, “Development of Latent Prints with Titanium Dioxide (TiO2)”, Jor. Forensic Identification, vol. 52, no. 5, Sept./Oct. 2002, pp. 551-559.
2. N.H. Williams and K.T. Elliott, “Development of Latent Prints Using Titanium Doxide (TiO2) in Small Particle Reagent, White (SPR-W) on Adhesives”, Jor. Forensic Identification, vol. 55, no. 3, May/June 2005, pp. 292-301.
3. K. M. Parisi, “Getting the Most of Your Fingerprint Powders”, Jor. Forensic Identification, vol. 49, no. 5, Sept./Oct. 2005, pp. 494-498.
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