A pH below 5 is a sign of healthy skin and healed wounds. A new technology allows doctors to know if a wound is healing or infected by changing color based on the pH. So if there is a shift from the acid to the alkaline, this is a sign that there are complications in the healing of the wound. A pH value between 6.5 und 8.5 means an infection is present.
Reference:
ScienceDaily. from http://www.sciencedaily.com /releases/2010/11/101116093821.htm
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