Unpreserved aqueous solution

Hello, I am working with an unpreserved aqueous solution with pH 3.8. The solution contains only water and one other ingredient. I was wondering for how long is such a solution safe to use topically if it is kept in a fridge at 8°C? I am worried about bacterial colonization but ideally I would like to use the solution for 3 days before making another batch.

Thanks for the help.


  • PharmaPharma Member, Pharmacist
    pH 3.8 in the fridge: 3 days for use on healthy skin should be okay but it might depend on that mystery ingredient of yours ;) .
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