Home Cosmetic Science Talk Formulating Unpreserved aqueous solution

  • Unpreserved aqueous solution

    Posted by Anonymous on July 24, 2019 at 9:31 am
    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.
    Pharma replied 4 years, 9 months ago 1 Member · 1 Reply
  • 1 Reply
  • Pharma

    July 24, 2019 at 7:06 pm

    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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