While working over an old camera (1920's to 1930's guess) I was dismantling an old set of bellows to use as a pattern to make a new set. I removed the outer layer first, and the stiffeners were of the ususal paper type, but the inner bellows material was actually a butyl rubber. Same type as an old inner tube, but thinner. Was this a common deal, or is this possibly perhaps just particular to this maker? It makes sense though. Light-tight. Waterproof. Flexible. I am considering leaving the stiffeners and the inner bellows and just recovering outer. Except for a few thin corners, it is in reasonably good conditon. And still flexible, not crunchy.
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