Black and white photo - want to print only black

[xc-runner]

I'm doing a job that's one color printed on a color background.

I'd like to print the photo so the black shows up black and the white turns into the color of the background it's being printed on.

In Photoshop I can easily make it look this way by setting the photo to multiply, it drops out all the white and just leaves the black, but of course if I turn off my "fake color bottom layer" the photo then changes back to b&w because it has nothing to multiply against.

so short of selecting all the white out of a photo which won't work because of grey tones, how can i get it to print this way?


Here's an example of what the end result would look like on the right:
http://img371.imageshack.us/img371/7205/clocksvl3.jpg

Thanks

[Jam]

You don't have to worry about it - printers do not print white!!
If I am right and your simply printing the clock on to coloured paper then their isn't anything to worry about. The printer only adds black ink.

[xc-runner]

LOL...wow, I was racking my brain trying to figure that out and it was so obvious!

Thanks