Review of Multiple Cosmetic Formulas: Compatibility, pH, and Texture

Based on the review of your formulas and the staff's responses:

Here is the compatibility and pH information for each of your formulas:

1. Body Lotion Formula

• Incompatibility: In your original formula, Zinc PCA was incompatible with Light Cream Maker due to its electrolyte nature, which would soften the texture. The staff recommended changing to Satin Cream Maker, which is more electrolyte tolerant. Your updated formula uses Satin Cream Maker, addressing this incompatibility. The staff also noted that Glycerin at 20% is very high; while not a direct incompatibility, it can make emulsification difficult and doesn't provide additional skin benefits beyond 5-10%, potentially causing stickiness or irritation at very high levels.
• pH Adjustment: pH adjustment is not mentioned as necessary for this formula.

2. Foot Cream Formula

• Incompatibility: Based on your clarified purpose (moisturizing and softening hardened ankles) and the ingredients listed in your updated formula, there are no mentioned incompatibilities.
• pH Adjustment: pH adjustment is not mentioned as necessary for this formula.

3. Night Facial Serum Formula

• Incompatibility: All ingredients in this formula are compatible according to the staff.
• pH Adjustment: pH adjustment is not necessary for this formula according to the staff.
• Other Notes: The staff noted that this formula might feel sticky on oily skin.

4. Clay Mask Formula

• Incompatibility: There are no mentioned incompatibilities in this formula.
• pH Adjustment: pH adjustment is not mentioned as necessary for this formula.
• Other Notes: The staff noted that some ingredients overlap with your other formulas, suggesting it might be redundant, but you clarified its specific purpose and usage frequency.

5. Lightweight Sunscreen Formula

• Incompatibility: There are no strict incompatibilities mentioned. However, the staff noted that TiO2 is likely redundant given the presence of SPF Protect Ultra II. They also mentioned that while Dimethicone can help with water resistance in an O/W formula, it might cause stickiness and won't provide as good water resistance as a Water-in-Oil formula (which requires blending). Isododecane does not contribute to water resistance as it evaporates.
• pH Adjustment: pH adjustment is not mentioned as necessary for this formula.
• Other Notes: The method for adding Matte Silica was discussed; adding it to the water phase first or to the finished cream base are both suggested methods to avoid grittiness.

In summary, the main incompatibility issue was in your original Body Lotion formula (ZnPCA with Light Cream Maker), which you addressed by changing the emulsifier. For the other formulas, ingredients are generally compatible, but notes were made regarding ingredient redundancy (Formula 5), potential texture issues (Formula 1, 3, 5), and the effectiveness of certain ingredients for achieving specific goals (Formula 5 water resistance). pH adjustment is not indicated as necessary for any of the formulas.