Mineral Makeup should be all natural, pure, untainted, however, some cosmetics companies will use Bismuth Oxychloride (b.o.) in their cosmetics because it is a very cheap filler. Bismuth does have binding qualities, so the makeup will hold to your skin better, however there are other products that are just as good at sticking to your skin, and are better for your skin.
Other than being a cheap filler it is also highly reflective, which is something cosmetics
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