Sirchie Hi-Fi Volcano Latent Fingerprint Powder, 2 oz Jar, Silk Black Black oxide powder for developing latent (non-visible) prints on nonporous surfaces such as painted wood, metal, and most plastics Black color enhances contrast with light-colored surfaces Adheres to oily or moist deposits, particularly sebaceous secretions that may contaminate the fingertips Produces optimal results on newer prints found on dry, smooth, non-adhesive surfaces Jar contains a 2oz. (59mL) volume of powder