Because the FDA has issued a new announcement about
สารกันแดด (dated 18 Feb 2019) specifying
สารกันแดด (both
Zinc Oxide and Titanium dioxide) for raw materials in the form of nano is permitted. and have specified properties about purity and crystal structure don't know
Zinc Oxide 35nm Liquid and
Titanium Dioxide 15nm Liquid (Gloss) What is the purity? and what kind of deep structure Because it is not specified in MSDS. Thank you.