Photoshop :: How To Change Color Of The Pictures

I have some scanned picture. (Actually they can also be photoed.) Specifically, they are Chinese calligraphics. They are color graphics although almost completely black. Their border are hairy, no clear cut border.
 
My question is:
 
How do you transform their color?
 
The original color is black, almost black, not gray scale. For design purpose, I would like to transform it into any desired color. (The color need to match with other part of the graph.) I cannot use color replacement, since it is not only one color. It is not only black.
 
I can only transform into some color, but not any arbitrary color since the black is too heavy, which are the original color mounted with some other color. I attached one such picture so that you may try it. The paper used caused some background which can be easily removed by adjusting it contrast and black/white threshold.