Handbook of Trace Evidence Analysis by Desiderio Vincent J.;Taylor Chris E.;Nic Daéid Niamh;

Author:Desiderio, Vincent J.;Taylor, Chris E.;Nic Daéid, Niamh; [Desiderio, Vincent J]
Language: eng
Format: epub
Publisher: John Wiley & Sons, Incorporated
Published: 2020-08-30T20:22:24+00:00

Figure 4.19 Transverse cross‐sections of a brown human head hair exhibiting peripherally concentrated pigment (left) and a red human head hair exhibiting centrally concentrated pigment (right) (mounted in xylene and viewed using transmitted light).

Individual pigment granules are typically ≤1 μm in human hair (Robbins 2002) but larger granules can be found in animal hairs (e.g. many rodent species have large granules which are principally located within the medulla) (Figure 4.20).

Figure 4.20 Cleared longitudinal cross‐section of a hair from a pet rat (Rattus norvegicus) exhibiting large, globular pigment granules in the medulla, a few of which are marked with arrows (mounted in glycerin and viewed using transmitted light).

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