Sunscreen Formulation with Titanium Dioxide 15nm Liquid and Zinc Oxide 35nm Liquid

You're looking for a sunscreen formula using Titanium Dioxide 15nm Liquid (Gloss) and Zinc Oxide 35nm Liquid for combination skin, aiming for SPF 50+++, and preferably a cold process.

Based on the product information for these ingredients, the recommended method for creating a stable water-in-oil emulsion using these specific liquid physical sunscreens involves heating.

Here is an example water-in-oil cream formula provided with the product information that achieved SPF 51.06, PA++:

• Water: 44%
• Cyclomethicone: 15%
• Titanium Dioxide 15nm Liquid (Gloss): 25%
• Zinc Oxide 35nm Liquid: 15%
• Mild Preserved Eco: 1%

Procedure:

1. Mix Cyclomethicone, Titanium Dioxide 15nm Liquid (Gloss), and Zinc Oxide 35nm Liquid together. Heat this mixture to 70°C and stir until combined.
2. While blending continuously, gradually add Water to the mixture.
3. Finally, add Mild Preserved Eco and stir to combine.

Please note that this procedure involves heating to 70°C to ensure proper emulsification and stability of the water-in-oil system with these specific ingredients.