I am writing this guide to inform people of certain chemicals that are used in Mineral Makeup. Bismuth Oxychloride is a chemical that produces shine. It is made up of microscopic metal. Certain brands use this in their minerals, because it is a cheap filler. Yes it does make you shine, however, most women 75% of them are allergic to this. You can tell if you are allergic if your face itches after using products that contain this chemical. As a chemist, I am actually surprised that the FDA has approved this for use in cosmetics. When you use a product containing bismuth oxychloride you are pushing into your pores small metallic particles that will clog your pores. Also you body will fight back because it is a foreign chemical that is being shoved into your pores. That is why some women notice itching, and rashes. They also use this in jet fuel refining. I will not use this chemical in my minerals period. So when you shop for Mineral cosmetics, make sure you are informed about the ingredients used.