Professional drum scanners would immerse the film in mineral oil. Epson used to ship a kit for their flatbeds. Popular with 8x10 photographers.
https://shootitwithfilm.com/what-are-newtons-rings-and-how-t...
Professional drum scanners would immerse the film in mineral oil. Epson used to ship a kit for their flatbeds. Popular with 8x10 photographers.