Forensics- Ch. 4 Fiber Evidence

Front 1

class

Back 1

Because fibers are mass produced, they are considered this type of evidence

Front 2

direct

Back 2

Transfer of fibers directly from suspect to victim or victim to suspect

Front 3

24

Back 3

Most fiber evidence falls off within this many hours of a crime

Front 4

color

Back 4

Scientists look at this first to try to match a fiber to a location

Front 5

polarizing

Back 5

Type of light microscope that allows scientists to use wavelengths of light to observe optical properties of fibers

Front 6

infrared

Back 6

Type of spectroscopy that allows scientists to visualize chemical structure of fibers

Front 7

staining

Back 7

A destructive test that allows scientists to compare absorption of different liquids into fabrics

Front 8

density

Back 8

A quick test used to classify fabric origins

Front 9

burn

Back 9

This type of test is used to compare melting points, odors, and ash formation of fiber samples

Front 10

chromatography

Back 10

A test used to analyze the components of dyes in a fabric

Front 11

fiber

Back 11

The smallest indivisible unit of a textile; made up of many filaments twisted or bonded together

Front 12

yarn

Back 12

Term for fibers that have been spun together

Front 13

textile

Back 13

Result of weaving yarns together

Front 14

warp

Back 14

The tight lengthwise yarn in a weave pattern

Front 15

weft

Back 15

The crosswise yarn in a weave pattern

Front 16

twill

Back 16

A diagonal weave pattern; resembles stair steps

Front 17

plain

Back 17

The simplest and most common weave pattern; looks like a checkerboard

Front 18

satin

Back 18

Weave pattern in which the Interlacing may not be uniform; results in shiny materials with little friction with other garments

Front 19

wrinkle

Back 19

Plain weave patterns are snag resistant but tend to do this

Front 20

thread count

Back 20

The number of threads that are packed together for any given amount of fabric

Front 21

natural

Back 21

Term for fibers that come from animals, plants, and mined minerals

Front 22

synthetic

Back 22

Term for man-made fibers produced from a raw material that is spun together in a factory

Front 23

fur

Back 23

Animal fiber left on the skin and treated; often used to make coats and gloves

Front 24

cashmere

Back 24

Fiber produced from goat hair

Front 25

angora

Back 25

Fiber produced from rabbit hair

Front 26

wool

Back 26

Fiber produced from sheep hair

Front 27

silkworm

Back 27

Silk comes from the cocoon of this caterpillar

Front 28

cellulose

Back 28

Plant fibers are made of this carbohydrate

Front 29

protein

Back 29

Animal fibers are made of this type of macromolecule

Front 30

seed

Back 30

Cotton comes from this part of a plant

Front 31

coconut

Back 31

Coir is most often used to make doormats and baskets and comes from this fruit

Front 32

cannabis

Back 32

Hemp comes from this plant

Front 33

stem

Back 33

Jute (used in rope, mats, handbags, and burlap sacks) comes from this part of a plant

Front 34

flax

Back 34

Plant used to make linen

Front 35

fiberglass

Back 35

A common mineral fiber; often used to insulate buildings

Front 36

asbestos

Back 36

Cancer-causing mineral found in rocks; used mainly because of its fire resistance

Front 37

monomers

Back 37

Small, repeating units that make up polymers

Front 38

Regenerated

Back 38

This category of fibers are derived from cellulose and produced by chemically modifying the natural polymers to create an entirely new compound not found in nature

Front 39

cellulose ester

Back 39

Regenerated fibers are made of this compound not found in nature

Front 40

rayon

Back 40

First man-made fiber; also the most common type of regenerated fiber

Front 41

acetate

Back 41

A less expensive, less polluting fiber alternative to rayon

Front 42

nylon

Back 42

The most durable, extremely light weight synthetic fiber; first introduced as artificial silk for pantyhose

Front 43

polyester

Back 43

The synthetic fiber used in polar fleece to provide warmth in the form of a lightweight, soft and resilient fabric

Front 44

acrylic

Back 44

The most widely used man-made fiber; inexpensive but tends to ball easily

Front 45

spandex

Back 45

A synthetic fiber known for its extreme elastic properties