WHAT IS THE DIFFERENCE BETWEEN A CHEMICAL FILTER AND A MINERAL SCREEN ?
Mineral screens provide protection against the whole UV spectrum by forming a thin protective that comes between sunlight and the skin.
Mineral screens are fine powders that have strong covering power. These pigmentary powders are made up of Zinc Oxide and Titanium Dioxide, that have the advantage being very well tolerated. They are active as soon as they are on the skin, absorbing and reflecting UV rays. Because of their size, they do not penetrate deeply into the skin.
Chemical filters also protect by forming a layer on the surface of the skin. However, they tend penetrate deeper into the skin because of their chemical nature (small size and being liposoluble). Some chemical filters are not stable when exposed to light, both losing efficacity and potentially becoming harmful free radicals. They are also suspected of some disruption of hormonal balances in the skin and can pollute the environment (causing coral bleaching for example).