Film can

They are typically a circular box pressed from thin sheet metal, but plastic examples are also used.

The last of these does not require the can to be light-tight, but environmental protection and exclusion of dust makes a similar container just as useful.

Dust caught in the velvet can scratch an entire roll of film.

For 35mm film, these cans were once made from pressed aluminium with a screw top, now moulded plastic with a push fit lid.

Before use, lengths of it are wound onto spools in a darkroom, then enclosed in cans or cassettes.