Darkroom vs Photoshop

You can do this in Photoshop, but doing it in a wet darkroom is much better.
It’s produced by turning on the lights while the print is still developing. The results are different each time you do it.
Viva la darkroom! Gator and Miki Vuckovich, Cardiff-by-the-Sea, CA. 1982. Photos and solarization by Grant Brittain