Chapter 14 Flashcards
Paint as physical evidence is most frequently encountered in what types of crime?
Hit-and-run.
What can the PDQ database help determine about a vehicle when paint chips are recovered?
The make, model, and year of the vehicle.
What is paint composed of?
Paint is made of pigments, binder, and solvents.
What is the role of the electrocoat primer on cars?
: Provides corrosion resistance.
What is the role of the primer surfacer on cars?
Smooths out imperfections and enhances adhesion of the basecoat.
What is the role of the basecoat on cars?
Provides the color and aesthetic appeal of the vehicle.
What is the role of the clearcoat on cars?
Adds protection and a glossy finish.
Which property of paint imparts it with its most distinctive forensic characteristics?
The layer structure.
What is the main ingredient in ordinary glass?
Sand (silicon dioxide).
Where is tempered glass used?
In car side windows/for protection.
What does flotation determine about a particle of glass?
Its density.
Describe radial cracks in glass.
Cracks that extend outward from the point of impact.
Describe concentric cracks in glass.
Cracks that form in a circular pattern around the point of impact.
What are the two most important physical properties of glass for forensic comparisons?
Density and refractive index.
What does the larger opening of a crater-shaped hole in glass indicate?
The exit side of the projectile.