How to distinguish high-quality glitter powder

How to distinguish high-quality glitter powder
1.The high-quality glitter powder has high brightness and obvious mirror effect.
2.If it is high-quality glitter powder, when we look at the shape of it under a microscope, the shape is a standard hexagon.
3. High-quality flash powder soaked in strong acid and strong base liquid for a long time, can still keep the color beautiful.