Effect of engine oil and benzene on blood stains

ABSTRACT

The present study was carried out to determine the effect of engine oil and benzene on the estimation of the age of blood stains in car accidents. The study included ten human blood samples. A sample of fresh blood was tested immediately. Then, the rest of each sample was spread into equal amounts on clean cotton fabrics and cotton fabrics soiled with oil, benzene as well as oil and benzene. Cotton fabrics were allowed to dry completely, then kept at room temperature to be examined at intervals of 1, 7, 14 and 30 days. Hemoglobin curves were drawn for each sample in the visible region of alpha double beam drawing spectrophotometer and the alpha ratio was calculated for each sample. The highest rate of alpha ratio degradation was found in blood stains soiled with oil and benzene, followed by the blood stains soiled with oil then the blood stains soiled with benzene