No digital trickery here, just a bleached Fuji FP-100c negative and some contrast adjustment.
4x5 Pacemaker Speed Graphic
Kodak Aero-Ektar 178mm f/2.5
Fuji FP-100c pack film
There are many videos and tutorials on the Web. Here are two decent write-ups:
Some people prefer to do it free-hand, brushing the bleach on the back of the negative to remove the backing while holding the negative in hand, but I tape mine to a piece of glass. Fairly easy, although a bit messy. Worth trying. I used to throw the negative side of my Fuji peel-apart films away but now I bleach them to see what I'll get. Not every negative looks good bleached, but some look rather nice, usually with artifacts from the bleaching process.
Wow! That's fabulous.