[Marianna]

Human hair is of course much better than synthetic. It feels and looks natural, and yes, you can color it, wash it, condition it, like real hair.

I forget where hair comes from - I always thought it was Asian, but a hairdresser told me that Asian hair can be nappy. I think she said hair comes from India, but I'm not sure.
They do strip the color and then recolor it. Usually that's the only one chemical processing, which is not bad.
The best quality hair is European hair - I heard that these are virgin: meaning the blonde hair you get came from a blonde person, nothing has been done.

I use human hair extentions (hairdreams) and have been extremely happy with it. It feels and looks natural, I even forget I have it in my hair (semi permanent, lasts 4-6 months).