This determines if your product will separate, change color, or alter its scent over time. You can perform an at home by placing a sample of your product in a incubator or warm environment (around 40°C-45°C) for 12 weeks. If the product remains uniform without separating into oil and water layers, it is considered stable for roughly 1 to 2 years at room temperature. 2. Challenge Testing (PET)
Heat oil and water phases to 70–75°C for emulsification. Cool to <40°C before adding actives. a-z of natural cosmetic formulation pdf
When oils spoil, usually indicated by a sharp, unpleasant smell. This determines if your product will separate, change
The skin’s natural pH is slightly acidic, around 4.7 to 5.5. usually indicated by a sharp