Science & Justice
Volume 51, Issue 4 , Pages 163-172, December 2011

Dichroism measurements in forensic fibre examination. Part 2 — Dyed polyamide, wool and silk fibres

Received 8 October 2010; received in revised form 26 October 2010; accepted 29 October 2010. published online 29 November 2010.

Abstract 

A number of dyed polyamide, wool and silk samples were examined with plane polarized light on their dichroic behavior by optical light microscopy (OLM) and microspectrophotometry with plane polarized light (MSP-PPL). It was found that most of these acid dyed peptidic fibres possess dichroism, but these are weaker than the effects previously described for polyester fibres. The small effects may be not observed, especially for wool, but these can be measured using MSP-PPL.

In the three peptidic fibre classes, for the first time, a so called “inverse dichroism” is observed which appears in the absorption spectra as a hyperchromic effect.

Keywords: Dichroism, Polyamide, Peptidic fibres, Acid dyes, Microspectrophotometry (MSP), Fibre examination

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PII: S1355-0306(10)00131-0

doi:10.1016/j.scijus.2010.10.005

Science & Justice
Volume 51, Issue 4 , Pages 163-172, December 2011

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