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"Believers & doubters of films". No sir, experience talking. What we are talking about is on the microscopic level which requires magnification beyond what I have. A razor for the face is a tool,...

Water hones and a few oil stones are for honing straight razors.
Sandpaper is for restoring.
Film is for camera's.
Diamonds are for women and knives.

Once you get the other crazy notions out...