Mica based powders: The Precious Pearl Pigments are mica based powders, which mix brilliantly into any medium. They are milled very finely and allow a subtle satiny finish, that adds shine to your project , Highly Pigmented: A little goes a long way with the mica pigments - they are high quality metallic powders, that are super pigmented. These mica powders only require you to use a tiny amount.