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FORENSIC BIOLOGY 101
Kastle-Meyer Colour Test













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At the crime scene many thoughts go through an investigators mind. One is the
 
presence of a deep red liquid. Although, not always is this deep red liquid
 
blood causing investigators to turn to the Kastle-Meyer Colour test for
 
confirmation. Blood hemoglobin contains enzymes that accelerate the oxidation
 
of some organic compounds by peroxide called peroxidases. When hydrogen
 
proxide is mixed together with blood, the blood will turn a deep oink colour.
 
Although this does not just pick up blood, it can pick up the presence of
 
potatoes and horseradish, must more often than not, potatoes and horseradish
 
do not come in the form of a deep red liquid. A filter paper can also be use to
 
rub on a surface which has already been "cleaned" of blood and by adding a
 
drop of hydrogen peroxide and phenolphthalein produce the same pink colour
 
the Kastle-Meyer test will provide.

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