Adhesives*
Dermatoglyphics*
Female
Freezing*
Heptanes
Humans
Image Enhancement
Microscopy
Middle Aged
Nitrogen*
Powders*
Solvents
Suspensions*
Technical Note:
Wetwop™ – Black/White
Wetwop™ – Black
Wetwop™ – White
Introduction:
Wetwop™ is used to process the sticky-side of adhesive tapes and labels for latent prints. As with any chemical process, we suggest that you experiment on non-evidence items to become familiar with this process before using it on evidence.
Wetwop™ can be used on the following adhesive surfaces:
Duct tape
Adhesive bandages
Paper-backed labels
Masking tape
Plastic surgical tape
Clear plastic tape
Packing labels
Double-sided foam tape
Reinforced packing tape
Cloth surgical tape
Adhesive edge of 3M™ Post-it® notes
Frosted plastic tape
Black electrical tape
Some paper labels and tapes and labels with dried-out adhesive
Some contact papers or shelf papers
Wetwop™ – Black was developed to process the adhesive surfaces of most colors. The solution will stain the residues of the fingerprint deposited on the adhesive surface. The solution has little background staining.
Wetwop™ – White was developed to process dark colored and clear adhesive surfaces. The solution will stain the residues of the fingerprint deposited on the adhesive surface.
In some instances, both black and white solutions can be used in sequence to present a contrast for better visualization of the prints.