Home Cosmetic Science Talk Formulating Strange! Can’t read the pH lever

  • Strange! Can’t read the pH lever

    Posted by Anna on May 28, 2015 at 10:59 pm

    HI every one

    I use pH strips for many formulas( i know i use this pH strip is not exact, but it still can work)
    This is the first time when i tried 4 different pH strips for my new formula (different levers) and none of them change any color. is any one know what’s wrong?
    Thank you!
    Anna replied 9 years ago 5 Members · 10 Replies
  • 10 Replies
  • ozgirl

    May 28, 2015 at 11:13 pm

    What is the type of formula?

  • Anna

    May 29, 2015 at 12:18 am

    hi @ozgirl

    the formula if for whitening+Anti Acne cream
    here is the formula;
    Distilled Water          50.450
    Aloe vera powder 200:1      0.280
    Xanthan Gum            0.300
    JOJOBA OIL    4.000
    Capryloyl Glycerin/Sebacic Acid Copolymer          4.000
    Caprylic Capric Triglycerides           2.000
     vitamin e natural     1.000
    C12-15 Alkyl Benzoate         4.000
    Stearic Acid : 1
    Cetyl Alcoho :2
    OLIVEM 1000            6.500
    Burdock Root [4:1] Powder 1.250
    white willow bark(16:1)      0.500
    Allantoin         0.500
    Sodium-L-Lactate      3.000

    Bearberry extract     6.000

    Phenoxyethanol        1.000

    citric acid        0.220

  • Chemist77

    May 29, 2015 at 4:15 am

    Looking at the formula I suppose the pH is in an acidic range where the strip is not registering a color change and it doesn’t look like a w/o emulsion too. Or make 10% aqueous solution of your lotion and try measuring the pH.

  • belassi

    May 29, 2015 at 2:35 pm

    Probably it is already at pH = 7 near as dammit.

  • Chemist77

    May 29, 2015 at 4:41 pm

    Guess @Belassi has a strong point, I bungled up between acidic and close to neutral.

  • OldPerry

    May 29, 2015 at 5:02 pm

    If you are serious about formulating it is well worth getting yourself a pH meter for more accurate measurements. 

    They aren’t even that expensive and are well worth the investment. Here are some examples.
  • Anna

    May 31, 2015 at 11:40 pm

    Thanks every one.Yes as @Belassi, the pH is neutral . any one suggest What is the best pH range for a Brightening cream?

    @Perry, i just ordered a pH mete already, should have it in next some days.
    1 more question, what is the normal viscosity for a cream formula ?
    Thank you !
  • OldPerry

    June 1, 2015 at 3:07 pm

    The viscosity of a cream formula depends on what you or your customers want.

    The range can be anywhere from 15,000 cps to 40,000 cps.  It really depends.
  • belassi

    June 1, 2015 at 5:18 pm

    What counts is the sensorials. Viscosity by itself is a primitive measure.

  • Anna

    June 3, 2015 at 11:25 pm

    Thanks @Perry and @Belassi

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