Cosmetics Appliion
COSMETICS FACE POWDERS "It must be remembered that a "fine powder" is, of course, a relative term. A generation of so ago "200 mesh" was considered very fine. Nowadays a 5075 micron particle seems rather coarse, and a material needs to be below 10 microns in size to be thought of as an "impalpable" powder. Perhaps in another twenty years even particles of 10 microns might be ...