Used for the presumptive identification of bloodstains, Hemident® is nondestructive and enables the investigator to retain the evidence intact for further laboratory analysis. Each test is a compact, self-contained unit, consisting of two ampoules of prescribed reagent within a disposable plastic tube. The reagents are reliable and sensitive, capable of identifying one part per million of blood. Hemident® was designed for field test use and, as such, will not distinguish between human and animal blood. Laboratory serology analysis is necessary to determine whether the source was human or animal. McPhail's Reagent produces a blue-green color.