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34 Cards in this Set

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The _ component of paint is commonly a mixture of inorganic and organic compounds and imparts color and hiding (or opacity).
pigment
The support within paint is provided by the _ component, which is a polymeric substance.
binder
True/False: Layers of paint are applied in the order of primer first, then surfacer, basecoat, and finally clearcoat.
True
The questioned and known paint specimens collected from a scene should be compared side by side under a __ microscope, which shows a three dimensional image, to look at color, surface texture and color layer sequence.
stereoscopic
In forensic comparison the most important physical property of paint is _.
layer structure
Paint can be individualized to a single source only when they have a sufficiently detailed _.
layer structure
True/False: Pyrolysis gas chroma. is a particularly valuable technique for characterizing paint's binder.
True
Pyrolysis gas chroma. yields a _ to reflect the chemical make-up of the binder.
pyrogam
The Royal Canadian Mounted Police's database is called _, allows an analyst to obtain information about a cars make, model and year.
PDQ/Paint Database Query
True/False: Paint samples removed for examination must always include all of the paint layers.
True
_ is defined as a hard, brittle, amorphous substance composed of sand (specifically, silicon oxides) mixed with various metal oxides.
glass
True/False: Automobile paint headlights and heat-resistant glass, such as Pyrex, are manufactured with lime oxide added to oxide mix.
False
_ glass fragments into small squares, or "dices," with little splintering when broken.
tempered
_ glass gains added strength from a layer of plastic inserted into two pieces of ordinary window glass; it is used in car windsheilds.
laminated
Broken glass that can be physically pieced back together has _ characteristics.
individual
The two most useful physical properties of glass for forensic comparisons are _ & _.
density & refractive index
Comparing the relative densities of glass fragments is readily accomplished by a method known as _.
floatation
When glass is immersed in a liquid of similar reactive index, its _ disappears and minimum contrast between glass and liquid is observed.
Becke line
The exact numerical density and reactive indices of glass can be correlated to their _ in order to assess the evidential value of the comparison.
frequency of occurrence
The fracture lines radiating outward from a crack in glass are known as _ fractures.
radial
Glass fracture lines that encircle the hole in the glass are known as _ fractures.
concentric
True/False: A crater-shaped hole in glass is wider on the side where the projectile entered the glass.
False
True/False: It is easy to determine from the size and shape of a hole in glass whether it was made by a bullet or some other projectile.
False
When glass's elastic limit is exceeded the first fractures develop into radial lines on the surface of the _ side of that of the penetrating force.
opposite
True/False: Stress marks on the edge of a radial crack are always perpendicular to the edge of the surface on which the impact force originated.
False
A fracture line from a successive impact will always _ at an existing line fracture.
terminate
Collected glass fragment evidence should be packaged in _ containers to avoid further breakage.
solid
Glass-containing shoes &/or clothing should be individually wrapped in _ and transmitted to the lab.
paper
True/False: Most soils have undistinguished color and texture.
False
Color and texture comparisons cannot be made on samples until they are all _ under identical lab conditions.
dried
Naturally occurring crystals commonly found in soils are _.
minerals
True/False: The ultimate value of soil as evidence depends on its uniqueness to the crime scene.
True
To develop an idea of the soil variation within the crime-scene area, standard/reference soils should be collected at various intervals within a _-yard radius of the crime scene.
100
True/False: Each object collected at the crime scene that contains soil evidence must be individually wrapped in plastic, with the soil intact and transmitted to the lab.
False