forensics

Which type of fingerprint is formed when a finger touches a surface after the ridges have been in contact with a colored material like blood or ink?

visible prints

How does the Reflected Ultraviolet Imaging System (RUVIS) differentiate a print from its background?

UV light strikes the print, and reflects back to the viewer.

Gray powder, used on dark or mirror-like surfaces, is primarily composed of:

Aluminum dust

A ridge impression left on soft material, such as putty, wax, or soap, is classified as a:

Plastic/patent print

For which type of surface would an investigator typically use powders or super glue treatments?

Hard, non-absorbent surfaces

Why might an investigator choose to use fluorescent powders over traditional powders?

Used when the print would be harder to see with normal powder

To make an iodine-developed print permanent for several months, it should be fixed with a 1% solution of:

Starch and water

Ninhydrin (triketohydrindene hydrate) is a chemical used specifically for prints on:

Porous surfaces like paper or cardboard

What color does a latent print typically appear after Super Glue fuming?

White appearing

While ninhydrin prints usually appear within an hour or two, weaker prints may take how long to visualize?

24-48 hrs

In the absence of heat, cyanoacrylate fumes can be created by placing the glue on absorbent cotton treated with:

Sodium hydroxide

Fluorescein is typically excited using which light source?

Cobalt blue light

Mikrosil is designed for what purpose?

designed to capture minute details on tool marks, firing pin impressions, and textured surfaces.

The Repository of Individuals of Special Concern (RISC) allows officers to compare fingerprints against high-risk individuals in as little as:

10 seconds

Dye combinations like RAM, RAY, and MRM 10 are used in conjunction with:

Super glue fuming

What is the first step an investigator must take once a latent print has been visualized?

Photographs must be taken before preservation

Which lifting tool is a thick, flexible layer that can conform to doorknobs or dashboards?

Rubber/gel lifters

How many fingerprints does the RISC application require to conduct a search?

Two index fingers

How does Molybdenum disulfide work to develop a print?

It works by adhering to fatty deposits in latent print residue

Which specialized casting silicone is described as "DNA-friendly" and cures in 4 minutes?

Accutrans