It certainly didn’t occur to anyone at the time that they would ever edit photos on computers. Photographers used color filters on their lenses. Nowadays, it is enough to move the gradation of any color in any editor. However, sometimes try attaching a color filter to the lens… You darken green, blue, and red on black-and-white negatives. You will get a contrasting post-apocalyptic atmosphere on the color negative.
Pentacon Six, Sonnar 180mm, BW red filter 090, Kodak Portra 160, C41