Blood+Detection+Outline+CVSII

Blood Detection Outline

Chemical Tests: • Haem forms crystal when reacted with certain reagents. The most common such reagent is pyridine, which forms characteristic pink crystal • These test rely on the fact that haem can catalyse the break down of hydrogen peroxide • A positive test does not mean that the given stain is blood. Various enzymes and certain metals can also give positive results

Instrumental Methods: • Chromatography can be used the identify the presence of haemoglobin • The instrumental methods are the ones used to find the more fainted and blurred blood stains • Its more precise and can help determine who’s blood it is