The Sirchie MAGNUCLEI Magnetic Latent Print Powder (16 oz Volume) is the result of years of research and development. Sirchie regular magnetic powders are already the best available, but there was a need for a dual purpose powder for finer dusting applications. MAGNUCLEI utilizes powders that have been milled to average particle sizes that are less than half the size of regular magnetic powders. This powder is very effective on glass, plastic, wood, ceramic and metallic surfaces - use on paper surfaces without leaving dark backgrounds. It works well on imitation and genuine leather if developed within a short time of being handled.