Home Cosmetic Science Talk Formulating Odd stability color change problem.

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  • Odd stability color change problem.

    Posted by BobG. on February 8, 2023 at 12:27 pm

    We have a formula with Copper PCA that has a green / blue color. It uses hydroxypropyl starch phosphate and Carbopol Ultrez 20 to add viscosity, stabilize the formula. We see a phenomenon during stability where elevated temp samples lose color from the bottom up. See pics.

    Does anyone have any advice on where to begin troubleshooting / solving the problem?

    Pharma replied 1 year, 3 months ago 4 Members · 3 Replies
  • 3 Replies
  • Graillotion

    Member
    February 8, 2023 at 4:13 pm

    Can’t see pics.

  • ketchito

    Member
    February 9, 2023 at 6:00 am

    Could you try removing Hydroxypropyl starch phosphate? It might be binding to copper from your copper PCA, especially at high T.

  • Pharma

    Member
    February 12, 2023 at 5:28 am

    What else is in that product?

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