Once again, I can't get the full-res version out here, but whatever.
I have been experimenting with colorizing B&W prints. Obviously, I'm not concerned with coloring in-the-lines, because this is artificial, and I'm not trying to pretend that it is not.
I'm doing this in DxO/NIK Silver Efex, which may seem counter-intuitive. That module has the option for adding color-tone to the "silver" (black parts) and/or "paper" (white parts) which you can mix-and-match and balance. The trick is that you can only get one color at a time, so these are built up layer-after-layer.
All images shot and scanned personally.