I am using the background-color property in CSS media type print.
The problem is that Google Chrome does not show background-colo
I think the issue is not with your code, but with Chrome: there is no option to print background (images or colors) : see http://www.google.com/support/forum/p/Chrome/thread?tid=17a4ac343580c8d3&hl=en
With Firefox, the background images are not printed by default, but it can be activated in "Print... -> Page setup"