Home Cosmetic Science Talk Formulating Off white Lightening Cream color

  • Off white Lightening Cream color

    Posted by GreenFrog on June 30, 2018 at 1:54 pm

    Please critique my lightening cream- 
    I am having a soaping effect and my color is off-white.  I would like for it to be white.  Do you think this is strong enough for darker complexions. Should I increase the arbutin?

    Water Phase—-
    Water (76%)
    Alpha Arbutin (0.98%)
    Allantoin (0.1%)
    EDTA (0.1%)

    Oil Phase—
    Olivem 1000 (2.5%)
    Stearic Acid (3.0%)
    Shea Butter (2.5%)
    Octyl Palmitate (1.0%)
    Cetyl Alcohol (1.5%)
    Cetearyl Alcohol (1.0%)
    Glycol Stearate (2.0%)
    Kojic Acid (2.0%)

    neutralize phase
    KOH (4% premix)

    Cool Down 
    Sodium Ascorbyl Phosphate (3.0%)
    Cucumber Extract (0.5%)
    Vitamin E (0.4%)
    Mulberry Bark Extract (0.5%)

    Mikrokill cos (1.0%)

    belassi replied 5 years, 10 months ago 5 Members · 5 Replies
  • 5 Replies
  • EVchem

    Member
    July 9, 2018 at 6:41 pm

    kojic acid is prone to discoloration over time. We use it cold process, but looks like you are heating so you may be speeding up the oxidation? What temperature do you go to?

    Of course it could be another ingredient as your culprit. Knockout test would probably be helpful for any suspects, I would say start with the Kojic acid though

  • Chemist5000

    Member
    July 9, 2018 at 7:02 pm

    I am heating the oil phase to 60C.  I dissolve it and add it in the cool down phase with the SAP.  Do I need more arbutin?

  • OldPerry

    Member
    July 9, 2018 at 7:54 pm

    The melting point of Stearic acid is 69C so you’ll want to heat it to at least that temperature or a few degrees higher.

  • Chemist5000

    Member
    July 9, 2018 at 8:16 pm

    @Perry  -thanks!!!—
     I was told i may need to neutralize the stearic acid.  is this true and should I wait till the end to do an adjustment?

  • belassi

    Member
    July 9, 2018 at 9:20 pm

    Try it and see what the pH is. You may well find it is directly suitable.

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