Again open in Photoshop & convert to B&W if you've not already done so.
While having the least number of steps & so therotically easier, I find this method less predictable/intuitive. Its more a question of moving the sliders around & seeing what happens
Add a color balance layer & in the dialog box select Shadows. Adjust the sliders until you're happy with the colours - this is where I dont find it particularly intuitive - it may be different for you.
CB 1.jpg
Now select Highlights & adjust
CB 2.jpg
And you're done