Hello, if you try to measure SPF/PA and members find that The developed formula provides the desired amount of sun protection. It doesn't need more.
Titanium Dioxide or
Zinc Oxide again, but if found that the sun protection Still not enough, you can add
physical sunscreen more
Titanium Dioxide has another benefit. is to increase skin coverage to the foundation formula as well. For the SPF/PA measurement, if members choose to use
สารกันแดด that the company sells in the formula can send a sample of the formula to the measurement company lab. SPF can also be given for free by reporting SPF from the company. Can be used to submit FDA notification (in case of SPF claim)