Coloured Micas are fine pigment-coated mica powders which are widely used in many cosmetic applications. They are almost all very alkali tolerant making them ideal for use in CP soaps as well as their main use which is in mineral make up. They add bright colour and irridescence to many cosmetic products, although their large particle size means they are not suitable in liquid bases or melt and pour soaps as they sink-out of suspension.
Cosmetic grade glitters are pigment or dye coated plastic flakes. Because some of their colour coatings are not always tolerant of extreme pH conditons nor of certain solvents, they are not all suitable for either CP soaps nor some cosmetic applications such as nail polish, so some testing may be required for specific applications. Microfine Glitters (150 microns or .006 Hex and under) are approved for use in eye make-up.
Glitters may either want to float or sink out of suspension in certain products so a 'suspension' base may be required for certain types of products when adding glitters.