Different rupture effects are evidenced in material, depending on whether the damage was done with a cutting, stabbing, tearing or twisting motion, which in turn is determined by the kind of instrument used. Examined were the effects of nine different thrusts at varying speeds, using five blade varieties and a corkscrew upon seven fabrics, including nylon hose; leather; cotton quilting, knit, jeans, and shirt material; and wool overcoat material. It is suggested that forensic investigators simulate the ways in which similar damage could be caused in a sample of the same cloth and employ photographic enlargements of the evidence. Illustrations are provided, as are 17 references.