Home Cosmetic Science Talk Formulating Soap scum formation in absence of soap or surfactant


  • Soap scum formation in absence of soap or surfactant

    Posted by Abdullah on May 19, 2024 at 9:47 am

    Sebum in scalp and hair has free fatty acids. Hard water has calcium. So if we wash our hair with hard water without any surfactant or soap in it, will Soap scum or Calcium-bridged fatty acid form and deposit on our hair?

    ketchito replied 3 weeks, 6 days ago 2 Members · 3 Replies
  • 3 Replies
  • ketchito

    May 20, 2024 at 8:12 am

    Keep in mind that sebum is a semi-solid, and caiclium ions are water soluble (at least partially). You need them both to be in the same phase for a reaction to occur.

    • Abdullah

      May 21, 2024 at 10:54 pm

      Then how sodium reacts with fatty acids?

  • ketchito

    May 22, 2024 at 6:53 am

    The ones we use in water-based cosmetics for instance, have shorter chain lenght and have better solubility (like in soaps), which helps with the process.

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