China's hair IS black. At least, in all the manga, webcomic, etc reference. In the anime, its made to be a dark brown (so he wouldn't have the same hair color as Japan, seeing as thats taboo or something to have in anime). But, since the anime isn't canon, most people pick his canon hair color.
If you're really set on him having brown hair, though, I suggest this wig
and then styling the bangs correctly yourself, as well as putting it into a low ponytail.