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Here is a riddle: Found old rolls of film among grandpas things. They are tightly wrapped in tin foil. Back in the day in Russia (where he was from) there were no disposable film canisters, all canisters had twist-off bottoms and were reloaded with film. So... I have no way of knowing if this foil-wrapped film is exposed or unexposed. If its exposed, will it get ruined if I put it through another round of development? Is there any safe way to open it to see if it already has pictures? How do I tell if there is anything on it without ruining it if it hasn't been exposed? Many thanks in advance!

marked as duplicate by Michael C, mattdm, xiota, Hueco, Romeo Ninov Nov 11 '18 at 9:02

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  • Do you have any way of knowing what film types? Are we assuming black and white or...? – Hueco Oct 29 '18 at 20:52
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    Also: How to test if my film was exposed or not – Michael C Oct 29 '18 at 21:08
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    Just for clarity, the steps are: unexposed -> exposed -> developed. So it doesn't really make sense to ask, "If it's exposed, will it get ruined if I put it through another round of development?" I suppose you mean, "if it's developed..." – osullic Oct 29 '18 at 22:14
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    Do you have experience developing film? Is this 135 or 120 film? I would go with the clip test, as suggested in one of the answers in How to test if my film was exposed or not – osullic Oct 29 '18 at 22:20

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