Skin goes red and slight burn sensation, what do you think is causing this?

nullafullanullafulla Member
edited January 2020 in Formulating
Hi guys,

I was hoping someone can tell me what you think might be causing the red/burning skin sensation.

Water - 74.79%
EDTA - 0.2%
Calcium Gluconate - 0.01%
Sodium Benzoate - 0.25%
Gluconolactone - 0.3%
Citric Acid - 0.2%
sodium dehydroacetate - 0.25%
Potassium Sorbate - 0.25%
Salicylic Acid - 0.1%
Aloe Vera (200x concentrate powder) - 0.1%
Green Tea Extract - 0.2%

Cocamidopropyl betaine - 1%
Allantoin -0.2%

Emuls Wax - Oliviem 1000 - 2%
Stearic Acid - 2%
Cetyl Alcohol - 1.5%
Sweet almond oil - 2%
Hemp Seed Oil - 1%


Vitamin E oil (mixed tocopherols 70%) - 0.5%
Phenoxyethanol - 0.25%

Glycerine - 2%
Xanthan Gum - 0.3%

Fragrance Oil - 0.5%
Koalin Clay - 4%
Panthenol - 0.5%
Niacimade -2%
Acai Powder - 4%

Thanks for you help in advance

Comments

  • PerryPerry Administrator, Professional Chemist
    It could be anything because everyone's skin has the potential to react to different chemicals differently.

    I'd guess the most likely candidates would be...
    Acai powder
    Phenoxyethanol
    Green tea extract
    Hemp seed oil
    Sweet almond oil
    or any of the other natural ingredients
  • BelassiBelassi Member, PCF student
    In order of probability:
    1. niacinamide (known for this effect)
    2. potassium sorbate
    3. phenoxyethanol

    And why are you using CAPB in a leave-on skin product?
    Cosmetic Brand Creation. Concept to name to IMPI search to logo and brand registration. In-house graphic design inc. Pantone specs. Cosmetic label and box design & graphics.
  • nullafullanullafulla Member
    edited January 2020
    Thanks Perry & Belassi for your thoughts & feedback. @Belassi The thought behind including CAPB in small amount (1%) was to thicken and help the masks cleansing effect.

    I do have a feeling it could be the CAPB though, so I'll do knock out and see how we go.
  • BelassiBelassi Member, PCF student
    edited January 2020
    Oh I see. I thought it was a skin cream, I didn't know it was a mask. I should have realised, with the clay. There's no bentonite in there is there? That's bad for redness.
    Cosmetic Brand Creation. Concept to name to IMPI search to logo and brand registration. In-house graphic design inc. Pantone specs. Cosmetic label and box design & graphics.
  • @Belassi Yeah sorry, I thought I mentioned initially it was a mask formula, I should have. No bentonite.

    I knocked the CAPB, redness still occurs. Thinking the  Acai extract next to knock out.
  • I had exactly this problem! It turned out to be the Potassium Sorbate and Sodium Benzoate preservative I was using. The redness and stinging was quite severe.  We had to ditch the entire batch.  
  • Potassium sorbate gives me flushing symptoms as well. Even at very low concentrations.

    Niacin is also known for giving flushing (niacinamide can hydrolyze to niacin under acidic conditions, although it is said this reaction takes a very long time).
  • @GabyD Can you tell me more about it?? Im really curious, I wanted to use that mix
  • Potassium sorbate seems to be quite notorious for redness to the face. I do not know about sodium benzoate.
  • czkld said:
    @GabyD Can you tell me more about it?? Im really curious, I wanted to use that mix
    Many people are sensitive to it. Including myself and my husband, who have never experienced sensitivity before and have two completely different skin types.

    I spoke to Thor extensively about this and they suggested I bring the pH up to 6 or 5.8 at a maximum. That whole batch went mouldy!

    I then discovered that Thor were WRONG and that Potassium Sorbate and Sodium Benzoate don't work at such a high pH.

    My advice would be to find another preservative.
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