Home Cosmetic Science Talk Formulating pink or brown in creams containing salicylic acid

  • pink or brown in creams containing salicylic acid

    Posted by ESN on February 17, 2024 at 12:22 am

    The reason for the color change to pink or brown in creams containing salicylic acid may be the effect of pH or the formation of salt or…

    dinogame replied 6 hours, 55 minutes ago 7 Members · 7 Replies
  • 7 Replies
  • Onur

    Member
    February 20, 2024 at 4:45 am

    Mostly because of light and air exposure, which is oxidation. Impurities or interactions with other ingredients in the formulation might be the culprit, too.

  • Abdullah

    Member
    February 20, 2024 at 8:49 pm

    Add some EDTA

  • ushassume

    Member
    February 21, 2024 at 4:57 am

    Ever noticed the color change in creams with salicylic acid? It’s like a chemistry experiment on your skin! The shift to pink or brown might be influenced by pH or the formation of salts. Science meets skincare in the most colorful way.

    @tunnel rush, how do you think?

  • ketchito

    Member
    February 21, 2024 at 6:31 am

    “Synthetic SA is white and odorless whereas natural SA, derived from the hydrolysis of methyl salicylate, may have a slight pink or yellow tint and a faint wintergreen-like odor.”

    Source: https://www.cosmeticsandtoiletries.com/cosmetic-ingredients/actives/blog/21837700/ingredient-profile-salicylic-acid

  • ketchito

    Member
    February 21, 2024 at 6:39 am

    “However, methyl
    salicylate does display the normal
    instability innate to the salicylate
    group; a pink-red discoloration in
    contact with traces of iron salts.”

    Source: https://img.perfumerflavorist.com/files/base/allured/all/document/2016/02/pf.9902.pdf

    I believe the pink color drift might be caused by methyl salicylate remains in the natural salicylic acid, when in contact with traces of iron

  • dallasflynn

    Member
    June 21, 2024 at 5:35 am

    The color change could be due to the effect of pH on the salicylic acid. Salicylic acid is a weak acid, and its color can change depending on the pH of the formulation. At lower pH levels (more acidic), salicylic acid may appear colorless or pale, while at higher pH levels (more basic), it can take on a pink or brown hue @shell shockers

  • dinogame

    Member
    July 17, 2024 at 1:27 pm

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