Talc, which may include natural mica. A warning if using dry pigments that talc may contain asbestos: Monona Rossol has done work to raise awareness on this hazard, so please consult her research even if you are using something labeled 'asbestos free' talc-- it may not actually be 'asbestos free' even though it’s labeled that way. It is worth looking into what she has found. Resources can be found at her site. Also please not that this may have silica which would be harmful to breathe. This ingredient is also not often listed on paint tubes, however it is an extender.
