forensics, hair and fiber evidence

Hair is composed of a protein

Keratin

Keratin is also primary component for

Finger and toe nail

Hair is produced from a structure called the

Hair follicle

Hair follicle is developed during

Fetal development

Hair colour is the result of

Pigments (reflect wavelengths of visible hair)

Hair is influenced by

Genes

Hair is affected by

Nutrition and intenational alterations

Contour chevrux

Cuticle

2e couche

medulla

Centre cheveux

Cortex

Cuticle and medulla important for distinguish

Species / different people

Smallest unit of a textile material

Fibre

Multiples fibers

Yarn

What affect transfer diners

Type, length, spinning method, fabric construction

Natural fibres

Plants and animals

Cotton

Plants fibers

Wool

Animal Fiber

Most fibers

Synthetic or man-nude

Nylon, rayon polyester

Synthetic fibres