Nope, it's technically not makeup! The Mario Badescu Silver Powder (P745) is more like a face mask and acne troubleshooter than anything else. It's a skincare product that could pass off as finishing powder - actually, if you really want to maximize it, you can add a pinch of it to your loose powder just to amp up the oil-controlling properties. Just a pinch for one jar, no more.
For the Silver Powder is crazy oil absorbent. It contains calcium carbonate, which is a kind of chalk commonly used in mineral makeup, as well as kaolin clay (usually found in masks and long-wearing makeup) and zinc oxide (a sunscreen agent). It's mission is clear and devastatingly simple: to absorb excess oil and bring blackheads to the surface.
To use, dip a damp cotton bud into the powder and cover your nose with the wet powder. That should bring out most of the oil and impurities hiding near the surface of the skin.