No abstract

Characteristics of fabrics are crucial for the appearance of bloodstains deposited on their surfaces. This applies particularly to absorbent surfaces, whose properties may have extreme influence on bloodstains. Experiments have shown that the modifications are the result of the type, texture and weave of the fabric. It has been proven that laundered or wet fabrics may change their properties, thus affecting bloodstain shape and size. Bearing in mind how many factors can influence the appearance of bloodstains, it is crucial for the BPA experts to properly plan and carry out the experiments demonstrating blood behavior on the analyzed substrates, before issuing an opinion. A „Bloodstains database” developed at the Central Forensic Laboratory of the Police within the frame of the R&D project could prove to be a useful tool for inferring the effect of different substrates on the appearance of bloodstains.