Indigo dye is used to dye denim and other fabrics. It is now accepted that if this is co-extracted with the DNA, it may inhibit PCR amplification. A simple, improved method is described for the extraction of DNA from bloodstained denim for PCR amplification and short tandem repeat (STR) analysis. The DNA was extracted by constructing a blotting system using capillary action to draw a saline solution through the denim. The transferred material was collected onto nylon membranes and these were processed by chelex extraction. A variety of coloured denim substrates and other heavily dyed fabrics, including case work samples were used. In all cases the DNA was extracted, amplified and typed correctly.
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