Our magnetic latent fingerprint powders are made with the same care and attention to detail as our standard powders. The Black Magnetic Latent Fingerprint Powder is best when dusting for prints on light surfaces. Use our powder only on non-pourous, non-ferrous surfaces. The product also must be applied with a magnetic applicator that acts as a ”brush” by creating a ball of powder. This ball is the only thing that touches the active surface. Packed in a 1 oz, polypropylene, shatter-resistant jar.