The “Red Scale” effect has actually been with us for quite a while. You see, your average 35mm color negative film has a semi-transparent layer on the back. – designed to keep stray light from getting onto the sensitive emulsion on the front. At some point, a few bright photographers got the idea to load the film “backwards” and actually shoot through this protective layer. The result is close to shooting through a reddish-orange filter. But unlike a filter, the effect is a bit unpredictable and varies in strength depending on the subject and light source.