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Home › Cosmetic Science Talk › Formulating › the colors on the bodywash and handsoap are faded

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  • ketchito

    Member
    January 19, 2023 at 12:52 pm

    @milania Under which conditions did you test for UV exposure, and for how long? Make the same test also with a benchmark, to see if you last the same.

    If you already have a UV filter, then the other option is that some free radicals might be forming, for which an antioxidant could be added (Tinogard TL comes to my mind). Also, check if there has been a pH drift, since dyes are pH sensitive.

  • milania

    Member
    January 20, 2023 at 4:44 am

    @ketchito I did the uv test in the direct sunlight and I did less than a week. I have done a ph test but nothing has changed. btw thanks for your feedback and suggestions @ketchito

  • ketchito

    Member
    January 20, 2023 at 11:49 am

    @milania My pleasure. Just in case, less than seven days for a UV test might be too little. Alwas evaluate some benchmark from the market, to have it as a reference (it they last way more, that might indicate you should tweak your formula to also last as long).

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