BLOOD DETECTION BY KASTLE-MEYER ON DIFFERENT FABRICS AFTER WASHING WITH DETERGENT CONTAINING ACTION OXYGEN

Abstract

The Kastle-Meyer test (KM) is a presumptive test for blood detection, commonly utilized for orientation in expertise exams. At crime scenes, it is common that the criminals seek to remove the blood stains present at the scene, in an attempt to hide traces, being washing with detergent the most common. Already was evidenced that oxygen active detergents, with sodium percabonate in your composition can inactive the KM test, but it has not yet been tested if another oxygen active detergent without this compound could inactivate the test. In this sense, the present study aimed to analyze the result of the KM test in fabrics with blood washed with an oxygen active detergent, to verify a possible inactivation of the referred test. For this, were utilized different fabrics common in clothe confection, which were exposed to blood for different times. After the exposition time, the fabrics were washed with the oxygen active detergent Vantage and parallelly with the detergent Ariel, aiming to evidence possible differences in the hematic material detection by the reagent according to the type of detergent utilized. The results obtained in this study showed that the tested oxygen active detergent didn’t compromise the capacity of KM test in detect blood in visible stains. These data reinforce the validity of the KM test in the presumptive detection of blood, even after the washing of fabrics with detergent indicated for stain removal.