Why does frost bite become black and seem like a burn(electric, black n singed)... with the blisters as well?:confused:

Blackness indicates destroyed flesh. Here are a couple good links about frostbite:
Frostbite - Wikipedia, the free encyclopedia (http://en.wikipedia.org/wiki/Frostbite)
Frostbite and Frostnip (http://www.thepoles.com/expguide/frostbite.htm)