Is there any difference in the use and effect between Tourmaline Powder and Negative Ion Powder?
Yes, there is. For Negative Ion Powder, the amount of generating negative ion can be tested in the air and its efficacy is obvious, it has certain radioactivity (Powder with higher amount of generating negative ion, there is stronger radioactivity.) it will have some actually accumulated side effect to human body. If you want to add powder in cosmetics, you should add Tourmaline Powder instead of Negative Ion Powder.
