MadSci Network: Cell Biology

Re: how comes blood comes out red but turns brownish color when it dries?

Date: Tue Sep 8 12:57:37 1998
Posted By: Lillian Mundt, Faculty, Clinical Laboratory Sciences, Finch University of Health Sciences/The Chicago Medical School
Area of science: Cell Biology
ID: 905266603.Cb

When blood is exposed to air it turns from red to brown. This is because
iron is a part of hemoglobin (which is what is inside the red blood cells)
giving blood its red color.  When the iron comes in contact with oxygen in 
the air it becomes oxidized and turns to a brown color.  This is similar to 
how metals which contain iron become rusty and change from their original 
color to a reddish-brown color.

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