Oil testing

I have a question from a client about what tests they can perform on their facial oil. It consists of all natural oils.

Is there any tests that would be good to perform on this oil for marketing claims, stability, rancidity etc? They are after actual chemical tests which I think would be expensive but if anyone has any ideas for tests please let me know.



  • Bill_TogeBill_Toge Member, Professional Chemist
    the Wijs iodine test (DIN 53241-1:1995-05) will give you the degree of unsaturation, which can be used to determine oxidative stability over time

    the peroxide value (determined by titration with iodide in acidic conditions) will give you an idea of rancidity - the lower the value, the better
    UK based cosmetic chemist with 13 years' experience at the bench. I've worked with pretty much everything apart from pressed powders, soap, solid lipstick and aerosols.
  • Thanks very much Bill! 
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