Abstract
Keywords: bending rigidity, blood stains, age determination, cotton fabric Abstract. Blood stains often appear at the scene of the crime. The age determination of blood stains can provide important information to speculate the time of crime. The relationship between the age of blood and the bending rigidity of blooded cotton fabric was investigated experimentally via the use of FAST-2 bending tester. Measure the bending length of blooded fabric at different time and calculate the bending rigidity, then the relationship between the age of blood and the bending rigidity is obtained through curve fitting. The result shows that the bending rigidity of blooded fabric is various with the increase in the age of blood stains and this relationship can be used to speculate the age of blood stains.
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