Discussion
The first step in the forensic examination of fibers for comparison is :
Answer: D
The first step is to compare both colour and diameter.
Fibre comparison begins with non-destructive screening under a stereo and comparison microscope, looking at colour, diameter, cross-section and surface features. Colour and diameter together quickly exclude fibres that cannot match, before any destructive chemical tests are done.
Colour alone or diameter alone is too weak a screen, since many fibres share one or the other. Chemical constitution (by FTIR, solubility or melting point) is determined later, only for fibres that survive the microscopic comparison.
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