This is described by Signature Minerals as a primer made of "pure, natural cosmetic clay that is white in color." But its not that great a primer. I actually think my mineral foundation is better off skipping this. While it controls oils and matts away the shine, my nose gets shiny and needs reapplying every 2 or 3 hours and then it gets cakey. Whereas normally my mineral foundation lasts twice as long. Also the color is a pale ashy beige that gives my fair golden skin a tired greyish look that ages me by 5 years when I put this on! Would it be better on neutral to cool or darker skin tones?? Since its made of pure Kaolin clay I made it into a deep cleansing face mask and refilled the sifter jar with something else.