I'm interested in doing some split toning. I really like the look of brownish / sepia highlights with more of a purple cast in the shadows. Ilford Warmtone paper will get the highlights about where I want them, but is there something that will change the shadows to what I want without affecting the highlight areas? I'd actually prefer something that might open up the shadows a touch, but that's not a requirement. I'm not looking for a huge purple shift, just something subtle.

I'll post an example of one I did with a scanned negative in Adobe Camera Raw. I'd like to do this for real if possible. I'm thinking Selenium on warmtone paper might get me there but I'll leave to the experts

Thanks for all your help