Magnetic latent print powders are similar in appearance to standard powders, but they contain iron so that they will adhere to a magnet. When a magnetic powder applicator is dipped into the jar of magnetic powder, the powder gathers around the magnetic end of the applicator and it becomes a "brush."
When dusting is complete, hold the applicator over the jar, and a short pull on the top end will lift the magnet, allowing the powder to drop back into the jar. For this reason, very little powder is wasted. The new wide-mouth jar of magnetic powder will accept the large ball of powder held on the tip of the magnetic applicator.