Choosing Cream Base for Adding OMC and Titanium Dioxide

Hello! I understand you're interested in mixing a ready-made cream base with 1%wt OMC (Octyl Methoxycinnamate) and 1-4%wt Titanium Dioxide dispersed in water for light testing. OMC is an oil-soluble chemical sunscreen, while Titanium Dioxide is a physical sunscreen which, in this case, is dispersed in water. When adding these two ingredients with different solubility properties (oil and water) to a ready-made cream base, it's important to consider compatibility and stability.

Based on the list of cream bases you provided:

1. Water Sleeping Mask Base / Cica Sleeping Mask Base: These bases typically have a high water content and a light texture. They might be suitable for adding water-dispersed Titanium Dioxide to some extent, but adding oil-soluble OMC may require careful mixing to ensure it integrates well without separating.
2. Skin Barrier Cream Base (Emulsifier Free): Emulsifier-free bases often use alternative technologies to create the cream texture, which can be delicate. Adding additional active ingredients, especially an oil-soluble substance and a water-dispersed substance simultaneously, can easily destabilize the base structure and cause separation. Therefore, this base may not be very suitable.
3. Powder To Coconut Oil Cream Base: This type of base seems designed to be mixed with coconut oil to form a cream. Incorporating active ingredients that include both oil-soluble and water-dispersed components might be difficult and unpredictable.
4. Absolue Soft Cream Base (compare to Lancome): This type of base is typically a more complex and highly stable emulsion compared to general bases. It is often designed to accommodate various types and amounts of active ingredients. It has a higher tendency to be compatible with both OMC (oil-soluble) and Titanium Dioxide (water-dispersed) if mixed correctly.

Recommendation:

Based on the properties of each base type, the Absolue Soft Cream Base appears to be the most suitable option for mixing with OMC and Titanium Dioxide. This is because it is likely a robust emulsion structure that can better handle the addition of active ingredients compared to the other bases on your list.

However, when adding active ingredients to any ready-made base, it should be done slowly with continuous mixing to ensure the ingredients are evenly dispersed throughout the cream and to prevent separation. Most importantly, you should test the compatibility and stability of the mixture in a small batch before using it for your light testing. This will ensure you get a smooth, homogeneous cream that remains stable for your experiments.

I hope this information is helpful! Please feel free to ask if you have any more questions.