Stability Issue: Cloudiness and Separation in Makeup Remover Formula
Question
I have created a makeup remover formulation with the following ingredients and percentages:
- MakeUp-Wash (PEG-6 Caprylic/Capric Glycerides) 5%
- Aloe Vera Extract 1%
- Gluconolactone (PHA) 2%
- Water 92%
When freshly made, the formula is clear and appears normal. However, after one day, it separates into layers and becomes cloudy. What is the cause of this?
Answer
Formulation Stability Issue: Cloudiness and Separation
The cloudiness and separation observed in your formulation after one day are likely due to an instability issue within the mixture.
Based on the ingredients provided:
- MakeUp-Wash (PEG-6 Caprylic/Capric Glycerides): This is a non-ionic surfactant designed to form micelles in water to cleanse the skin.
- Aloe Vera Extract: This extract contains electrolytes.
- Gluconolactone (PHA): This ingredient is acidic.
Electrolytes (from Aloe Vera) and changes in pH (due to Gluconolactone) can sometimes interfere with the stability of surfactant systems, particularly non-ionic micelles like those formed by MakeUp-Wash. This interference can cause the micelles to break down or aggregate, leading to the mixture becoming cloudy and separating over time, even if it was clear initially.
To improve stability in future formulations, you might consider:
- Adjusting the pH of the final mixture, although this needs careful consideration as Gluconolactone's efficacy is pH-dependent.
- Exploring different types of surfactants or surfactant blends that are more tolerant of electrolytes and lower pH conditions.
- Optimizing the mixing process or order of ingredient addition.
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