FRSC 2600 Exam 4(with solved solutions)
pigments correct answers colorant particulates that are suspended or dispersed in solvent matrix
additives correct answers drying agents
plasticizers
anti foaming agents
antimicrobial agents
dispersing agents/surfactants
binders/resins correct answers allows pigment to be distributed across the surface
solvents correct answers ensures that the colorant is homogeneously suspended and delivered
evenly to the substrate
once pigment and additives are in place, it evaporates
automotive finishes correct answers complex layering system
pretreatment
primer
topcoat
clearcoats
pretreatment correct answers steel surfaces of cars protected from corrosion by zinc-
galvanization
primer correct answers usually an epoxy resin w corrosion-resistant pigments
color coordinates w final color
topcoat correct answers may be in the form of a single color layer coat, a multilayer coat or a
metallic color coat
clearcoats correct answers unpigmented coatings applied to improve gloss and durability of a
vehicle's coating
art paints correct answers coatings used in artistic compositions
forgery cases
paint chips correct answers pieces of paint which have come off a surface
usually contain all of the layers of paint
paint smears correct answers transfer of paint when a painted object strikes a glancing blow to
another object
, collection correct answers lifting loose flakes, cutting samples of paint, dislodge samples by
bumping the opposite side of the painted surface
Q samples correct answers contain all loose or transferred paint materials
solvent and microchemical tests (paint) correct answers performed on known and unknown (?)
samples simultaneously
used to discriminate between paint layers w diff pigment and binder composition that are
visually similar
polarized light microscopy (PLM) - paint correct answers exam of layer structure,
comparison/identification of particles present (pigments, extenders, additives, contaminants)
fluorescence microscopy correct answers screening and analyzing paints
microspectrophotometry correct answers categorize and discriminate between visually similar
(metametric) parts
spectroscopy correct answers IR/Raman
characterize colorants, binders, coatings, film former, pigments and additives
HPLC correct answers alternative for pigments that won't GC well
elemental analysis correct answers x-ray diffraction
x -ray fluorescence/energy dispersive spectrometry
scanning electron microscopy
SEM/EDS correct answers inorganic pigments
excellent for single, top layer analysis, and paint smears
composition of soil correct answers organic + inorganic + foreign material
organic material correct answers decayed vegetative and animal matter
inorganic material correct answers crushed rock and clay
forensic significance of soil correct answers class evidence
easily transported
variability horizontally and vertically
areas w a lot of soil movement, time considerations
pigments correct answers colorant particulates that are suspended or dispersed in solvent matrix
additives correct answers drying agents
plasticizers
anti foaming agents
antimicrobial agents
dispersing agents/surfactants
binders/resins correct answers allows pigment to be distributed across the surface
solvents correct answers ensures that the colorant is homogeneously suspended and delivered
evenly to the substrate
once pigment and additives are in place, it evaporates
automotive finishes correct answers complex layering system
pretreatment
primer
topcoat
clearcoats
pretreatment correct answers steel surfaces of cars protected from corrosion by zinc-
galvanization
primer correct answers usually an epoxy resin w corrosion-resistant pigments
color coordinates w final color
topcoat correct answers may be in the form of a single color layer coat, a multilayer coat or a
metallic color coat
clearcoats correct answers unpigmented coatings applied to improve gloss and durability of a
vehicle's coating
art paints correct answers coatings used in artistic compositions
forgery cases
paint chips correct answers pieces of paint which have come off a surface
usually contain all of the layers of paint
paint smears correct answers transfer of paint when a painted object strikes a glancing blow to
another object
, collection correct answers lifting loose flakes, cutting samples of paint, dislodge samples by
bumping the opposite side of the painted surface
Q samples correct answers contain all loose or transferred paint materials
solvent and microchemical tests (paint) correct answers performed on known and unknown (?)
samples simultaneously
used to discriminate between paint layers w diff pigment and binder composition that are
visually similar
polarized light microscopy (PLM) - paint correct answers exam of layer structure,
comparison/identification of particles present (pigments, extenders, additives, contaminants)
fluorescence microscopy correct answers screening and analyzing paints
microspectrophotometry correct answers categorize and discriminate between visually similar
(metametric) parts
spectroscopy correct answers IR/Raman
characterize colorants, binders, coatings, film former, pigments and additives
HPLC correct answers alternative for pigments that won't GC well
elemental analysis correct answers x-ray diffraction
x -ray fluorescence/energy dispersive spectrometry
scanning electron microscopy
SEM/EDS correct answers inorganic pigments
excellent for single, top layer analysis, and paint smears
composition of soil correct answers organic + inorganic + foreign material
organic material correct answers decayed vegetative and animal matter
inorganic material correct answers crushed rock and clay
forensic significance of soil correct answers class evidence
easily transported
variability horizontally and vertically
areas w a lot of soil movement, time considerations
