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  • adrianag

    Member
    November 8, 2022 at 12:42 pm in reply to: pH drift in sunscreen formulations

    Good point, thank you. The other ingredients are:
    Water, Hydroxyethylcellulose, propanediol, tetrasodium glutamate diacetate, sodium hyaulronate, Ammonium styrene/MA Copolymer. 

  • adrianag

    Member
    November 7, 2022 at 7:40 pm in reply to: pH drift in sunscreen formulations

    I made a 20% ZnO sunscreen and the pH increased from 6.43 to 9.87 over a month. Someone mentioned a pH drift in mineral sunscreen and didn’t elaborate so I wanted to learn more. 

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