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I have my film developer and fixer in the plastic bottles, also I have glycerine and propylene glycol. They all have paper seals (in caps) that those chemicals get wet and destroy - they just fell apart. If they are so unstable why are they used in the first place, and what can I do to preserve the chemicals from oxidation once paper seal is destroyed?

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  • $\begingroup$ Cheaper. Replace the seal with rubber. $\endgroup$ – Karl Aug 30 at 6:58

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