write_light ([identity profile] write-light.livejournal.com) wrote in [community profile] vintageads 2015-07-02 09:51 pm (UTC)

It's actually (or *was* back then) a biodegradable cellulose film, not a petroleum based plastic. Wiki says "manufactured full time since the 1930s". It was the basis of scotch tape (cellotape) too. :)
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