3 thoughts on “Optiphen

    1. I use pH strips to test products that contain water/aloe/other water soluble ingredients. Optiphen comes in various versions. Regular Optiphen is oil-soluble and works at pH between 4-8. However, Optiphen ND is water-soluble and only works when the pH is 6 or below. You must follow the guidelines of the supplier where you bought the Optiphen and pay attention to which version you need that will work best for you.

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