Since I began working in polymer clay, aside from chalk pastels, paints and polymer clay... I love them all and have gotten into the collecting of mica powders. They may be best known by a couple of brand names Pearl Ex and Perfect Pearls. Mica is actually a natural mineral that somehow has been processed in a manner that has been turned into a fine powdered pigment with great shimmer and special effects. It can be used on raw polymer clay or mixed into glazes, clays, liquid clay, gel mediums for acrylics and the like - even water and a spray bottle.
Not Just Eyeshadow!
Below is a video with more details about making swatches of your powders as well as some important notes about Primary Elements Pigment/Mica Powders by Luminary. Take a look.