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The current emphasis on DNA technology in forensic science has led many to believe that trace evidence examinations, including fibers, may be of little value. Reasons are given here to show that this is an erroneous assumption. In the face of this situation, fibers examiners have been challenged to consider ways in which they can improve the services they… (More)
The use of a Nanospec 10 S microspectrophotometer to examine minute bloodstains is discussed. To satisfy criteria for chemical identity, absorption spectra were recorded before and after treatment of the blood with Takayama reagent. The technique is of value where only tiny particulate bloodstains are available for testing and in other specialized instances.
An improved technique for recording infrared spectra from minute amounts of synthetic fibers by using KBr micropellets is described. The procedure is the same for all commonly encountered synthetic fiber varieties; hence, no preliminary identification is required.
Forensic scientists are faced with the problem of estimating the frequency of cotton fibres recovered in casework, in relation to those in the general population. One way of doing this is to consider the degree of spectral variation that occurs within a "block of colour". When a spectral pattern occurs very frequently, the evidential value of the fibres may… (More)
This project was a target fibre study carried out by the European Fibres Group. Thirty-eight participating laboratories in nineteen countries searched four hundred and thirty five randomly selected top outer garments. The acrylonitrile/vinyl acetate co-polymer target fibre matched those in a red acrylic scarf, marketed in nine of those countries. The sales… (More)
This study describes the characteristics of modacrylic fibres and includes over 80 samples (previous and current) representing 15 trade names. Fibre morphology was examined using brightfield microscopy. Signs of elongation were determined using polarised light microscopy. Fibre cross sections were also examined. The generic class of fibre was divided into… (More)
The improved quality of spectra recorded using FTIR-microspectroscopy has meant that a lot more information is now obtainable from the spectra of dyed acrylic fibres. In addition to the main absorptions produced by the polymer material, additional absorptions resulting from the fibre dye are often present. An attempt has been made to explain some of the… (More)
The techniques used for present day recovery, examination, and comparison of textile fibers in forensic science are outlined. The author has not concentrated on the already well established theories of transfer and persistence and the basic methodology, as these topics have been repeatedly reported in detail relatively recently. Instead he has given his… (More)