by staff » Sun Dec 19, 2021 8:27 pm
Hello, Zinc Oxide group can block blue light, IR, visible light. There is no measurement standard. Protection against these 3 types of light, so I can't answer how much to use. To get the light protection, how much? Expand as follows: If it is UVA/UVB, we currently have acceptable measurement standards to be able to test that. At what rate of use, how much UVA/UVB can be blocked, comes out as SPF/PA, but in the case of 3 light that the member asked No agency yet set as a standard measurement value
Staff - MySkinRecipes